631089869 has 4 divisors (see below), whose sum is σ = 631200444. Its totient is φ = 630979296.

The previous prime is 631089829. The next prime is 631089913. The reversal of 631089869 is 968980136.

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 42445225 + 588644644 = 6515^2 + 24262^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-631089869 is a prime.

It is a super-2 number, since 2×631089869² = 796548845508874322, 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 (631089829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46232 + ... + 58305.

It is an arithmetic number, because the mean of its divisors is an integer number (157800111).

Almost surely, 2^631089869 is an apocalyptic number.

It is an amenable number.

631089869 is a deficient number, since it is larger than the sum of its proper divisors (110575).

631089869 is a wasteful number, since it uses less digits than its factorization.

631089869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110574.

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 631089869 is about 25121.5021246740. The cubic root of 631089869 is about 857.7559437382.

The spelling of 631089869 in words is "six hundred thirty-one million, eighty-nine thousand, eight hundred sixty-nine".