31917834899690 has 32 divisors (see below), whose sum is σ = 58073849907840. Its totient is φ = 12629241273024.

The previous prime is 31917834899603. The next prime is 31917834899693. The reversal of 31917834899690 is 9699843871913.

It is a super-2 number, since 2×31917834899690² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31917834899693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16148585 + ... + 18017004.

It is an arithmetic number, because the mean of its divisors is an integer number (1814807809620).

Almost surely, 2^{31917834899690} is an apocalyptic number.

31917834899690 is a deficient number, since it is larger than the sum of its proper divisors (26156015008150).

31917834899690 is a wasteful number, since it uses less digits than its factorization.

31917834899690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34166606.

The product of its (nonzero) digits is 634894848, while the sum is 77.

The spelling of 31917834899690 in words is "thirty-one trillion, nine hundred seventeen billion, eight hundred thirty-four million, eight hundred ninety-nine thousand, six hundred ninety".