31810913279987 has 2 divisors, whose sum is σ = 31810913279988. Its totient is φ = 31810913279986.

The previous prime is 31810913279941. The next prime is 31810913280007. The reversal of 31810913279987 is 78997231901813.

It is a strong prime.

It is an emirp because it is prime and its reverse (78997231901813) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31810913279987 - 2⁸ = 31810913279731 is a prime.

It is not a weakly prime, because it can be changed into another prime (31810912279987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15905456639993 + 15905456639994.

It is an arithmetic number, because the mean of its divisors is an integer number (15905456639994).

Almost surely, 2^{31810913279987} is an apocalyptic number.

31810913279987 is a deficient number, since it is larger than the sum of its proper divisors (1).

31810913279987 is an equidigital number, since it uses as much as digits as its factorization.

31810913279987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41150592, while the sum is 68.

The spelling of 31810913279987 in words is "thirty-one trillion, eight hundred ten billion, nine hundred thirteen million, two hundred seventy-nine thousand, nine hundred eighty-seven".