31007361691 has 2 divisors, whose sum is σ = 31007361692. Its totient is φ = 31007361690.

The previous prime is 31007361661. The next prime is 31007361743. The reversal of 31007361691 is 19616370013.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31007361691 - 2¹⁵ = 31007328923 is a prime.

It is a super-2 number, since 2×31007361691² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31007361691.

It is not a weakly prime, because it can be changed into another prime (31007361661) by changing a digit.

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 as a sum of consecutive naturals, namely, 15503680845 + 15503680846.

It is an arithmetic number, because the mean of its divisors is an integer number (15503680846).

Almost surely, 2^31007361691 is an apocalyptic number.

31007361691 is a deficient number, since it is larger than the sum of its proper divisors (1).

31007361691 is an equidigital number, since it uses as much as digits as its factorization.

31007361691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412, while the sum is 37.

The spelling of 31007361691 in words is "thirty-one billion, seven million, three hundred sixty-one thousand, six hundred ninety-one".