630022181 has 4 divisors (see below), whose sum is σ = 630645132. Its totient is φ = 629399232.

The previous prime is 630022177. The next prime is 630022219. The reversal of 630022181 is 181220036.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 88529281 + 541492900 = 9409^2 + 23270^2 .

It is a cyclic number.

It is not a de Polignac number, because 630022181 - 2² = 630022177 is a prime.

It is a super-2 number, since 2×630022181² = 793855897103993522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630022381) 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, 309956 + ... + 311981.

It is an arithmetic number, because the mean of its divisors is an integer number (157661283).

Almost surely, 2^630022181 is an apocalyptic number.

It is an amenable number.

630022181 is a deficient number, since it is larger than the sum of its proper divisors (622951).

630022181 is a wasteful number, since it uses less digits than its factorization.

630022181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622950.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 630022181 is about 25100.2426482295. The cubic root of 630022181 is about 857.2719489206.

The spelling of 630022181 in words is "six hundred thirty million, twenty-two thousand, one hundred eighty-one".