31690616690 has 16 divisors (see below), whose sum is σ = 57459485592. Its totient is φ = 12583718784.

The previous prime is 31690616689. The next prime is 31690616717. The reversal of 31690616690 is 9661609613.

It can be written as a sum of positive squares in 4 ways, for example, as 21243937009 + 10446679681 = 145753^2 + 102209^2 .

It is a super-2 number, since 2×31690616690² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11564549 + ... + 11567288.

Almost surely, 2^31690616690 is an apocalyptic number.

31690616690 is a deficient number, since it is larger than the sum of its proper divisors (25768868902).

31690616690 is a wasteful number, since it uses less digits than its factorization.

31690616690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23131981.

The product of its (nonzero) digits is 314928, while the sum is 47.

The spelling of 31690616690 in words is "thirty-one billion, six hundred ninety million, six hundred sixteen thousand, six hundred ninety".