31989515049 has 12 divisors (see below), whose sum is σ = 46344194676. Its totient is φ = 21263058432.

The previous prime is 31989515039. The next prime is 31989515069. The reversal of 31989515049 is 94051598913.

31989515049 is a `hidden beast` number, since 3 + 1 + 9 + 89 + 51 + 504 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 21570209424 + 10419305625 = 146868^2 + 102075^2 .

It is not a de Polignac number, because 31989515049 - 2¹² = 31989510953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31989514986 and 31989515004.

It is not an unprimeable number, because it can be changed into a prime (31989515029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5270544 + ... + 5276609.

It is an arithmetic number, because the mean of its divisors is an integer number (3862016223).

Almost surely, 2^31989515049 is an apocalyptic number.

It is an amenable number.

31989515049 is a deficient number, since it is larger than the sum of its proper divisors (14354679627).

31989515049 is a wasteful number, since it uses less digits than its factorization.

31989515049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10547496 (or 10547493 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 54.

The spelling of 31989515049 in words is "thirty-one billion, nine hundred eighty-nine million, five hundred fifteen thousand, forty-nine".