31387142923 has 2 divisors, whose sum is σ = 31387142924. Its totient is φ = 31387142922.

The previous prime is 31387142909. The next prime is 31387143059. The reversal of 31387142923 is 32924178313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31387142923 - 2⁹ = 31387142411 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31387142923.

It is not a weakly prime, because it can be changed into another prime (31387242923) 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, 15693571461 + 15693571462.

It is an arithmetic number, because the mean of its divisors is an integer number (15693571462).

Almost surely, 2^31387142923 is an apocalyptic number.

31387142923 is a deficient number, since it is larger than the sum of its proper divisors (1).

31387142923 is an equidigital number, since it uses as much as digits as its factorization.

31387142923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 43.

The spelling of 31387142923 in words is "thirty-one billion, three hundred eighty-seven million, one hundred forty-two thousand, nine hundred twenty-three".