31371311687 has 2 divisors, whose sum is σ = 31371311688. Its totient is φ = 31371311686.

The previous prime is 31371311677. The next prime is 31371311723. The reversal of 31371311687 is 78611317313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31371311687 - 2¹⁸ = 31371049543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31371311627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15685655843 + 15685655844.

It is an arithmetic number, because the mean of its divisors is an integer number (15685655844).

Almost surely, 2^31371311687 is an apocalyptic number.

31371311687 is a deficient number, since it is larger than the sum of its proper divisors (1).

31371311687 is an equidigital number, since it uses as much as digits as its factorization.

31371311687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 41.

The spelling of 31371311687 in words is "thirty-one billion, three hundred seventy-one million, three hundred eleven thousand, six hundred eighty-seven".