31685858613 has 8 divisors (see below), whose sum is σ = 46942012800. Its totient is φ = 21123905724.

The previous prime is 31685858599. The next prime is 31685858653.

31685858613 is a `hidden beast` number, since 3 + 1 + 6 + 8 + 58 + 586 + 1 + 3 = 666.

31685858613 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 31685858613 - 2⁹ = 31685858101 is a prime.

It is a super-3 number, since 3×31685858613³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31685858613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31685858653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 586775133 + ... + 586775186.

It is an arithmetic number, because the mean of its divisors is an integer number (5867751600).

Almost surely, 2^31685858613 is an apocalyptic number.

It is an amenable number.

31685858613 is a deficient number, since it is larger than the sum of its proper divisors (15256154187).

31685858613 is a wasteful number, since it uses less digits than its factorization.

31685858613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173550328 (or 1173550322 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 54.

The spelling of 31685858613 in words is "thirty-one billion, six hundred eighty-five million, eight hundred fifty-eight thousand, six hundred thirteen".