31904032689 has 9 divisors (see below), whose sum is σ = 46084376793. Its totient is φ = 21268997892.

The previous prime is 31904032681. The next prime is 31904032691. The reversal of 31904032689 is 98623040913.

It is a happy number.

The square root of 31904032689 is 178617.

It is a perfect power (a square), and thus also a powerful number.

31904032689 is a `hidden beast` number, since 319 + 0 + 4 + 0 + 326 + 8 + 9 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 31904032689 - 2³ = 31904032681 is a prime.

It is a super-3 number, since 3×31904032689³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (31904032681) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 506082 + ... + 565620.

Almost surely, 2^31904032689 is an apocalyptic number.

31904032689 is the 178617-th square number.

31904032689 is the 89309-th centered octagonal number.

It is an amenable number.

31904032689 is a deficient number, since it is larger than the sum of its proper divisors (14180344104).

31904032689 is an frugal number, since it uses more digits than its factorization.

31904032689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119084 (or 59542 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The spelling of 31904032689 in words is "thirty-one billion, nine hundred four million, thirty-two thousand, six hundred eighty-nine".