630888481 has 4 divisors (see below), whose sum is σ = 630941764. Its totient is φ = 630835200.

The previous prime is 630888469. The next prime is 630888491. The reversal of 630888481 is 184888036.

630888481 is a nontrivial binomial coefficient, being equal to C(35522, 2).

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 394221025 + 236667456 = 19855^2 + 15384^2 .

It is a 3-Lehmer number, since φ(630888481) divides (630888481-1)³.

It is a cyclic number.

It is not a de Polignac number, because 630888481 - 2⁵ = 630888449 is a prime.

It is a super-2 number, since 2×630888481² = 796040550916974722, which contains 22 as substring.

It is a deceptive number, since it divides R_630888480.

It is not an unprimeable number, because it can be changed into a prime (630888421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1 + ... + 35521.

It is an arithmetic number, because the mean of its divisors is an integer number (157735441).

It is a Poulet number, since it divides 2^630888480-1.

Almost surely, 2^630888481 is an apocalyptic number.

630888481 is the 35521-st triangular number and also the 17761-st hexagonal number.

630888481 is the 11841-st centered nonagonal number.

It is an amenable number.

630888481 is a deficient number, since it is larger than the sum of its proper divisors (53283).

630888481 is a wasteful number, since it uses less digits than its factorization.

630888481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53282.

The product of its (nonzero) digits is 294912, while the sum is 46.

The square root of 630888481 is about 25117.4935254296. The cubic root of 630888481 is about 857.6646941183.

It can be divided in two parts, 630 and 888481, that added together give a triangular number (889111 = T₁₃₃₃).

The spelling of 630888481 in words is "six hundred thirty million, eight hundred eighty-eight thousand, four hundred eighty-one".