31995690739 has 2 divisors, whose sum is σ = 31995690740. Its totient is φ = 31995690738.

The previous prime is 31995690679. The next prime is 31995690751. The reversal of 31995690739 is 93709659913.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31995690739 - 2⁷ = 31995690611 is a prime.

It is a super-2 number, since 2×31995690739² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31995690799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15997845369 + 15997845370.

It is an arithmetic number, because the mean of its divisors is an integer number (15997845370).

Almost surely, 2^31995690739 is an apocalyptic number.

31995690739 is a deficient number, since it is larger than the sum of its proper divisors (1).

31995690739 is an equidigital number, since it uses as much as digits as its factorization.

31995690739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12400290, while the sum is 61.

The spelling of 31995690739 in words is "thirty-one billion, nine hundred ninety-five million, six hundred ninety thousand, seven hundred thirty-nine".