31787041939 has 2 divisors, whose sum is σ = 31787041940. Its totient is φ = 31787041938.

The previous prime is 31787041931. The next prime is 31787041967. The reversal of 31787041939 is 93914078713.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31787041939 - 2³ = 31787041931 is a prime.

It is not a weakly prime, because it can be changed into another prime (31787041931) 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, 15893520969 + 15893520970.

It is an arithmetic number, because the mean of its divisors is an integer number (15893520970).

Almost surely, 2^31787041939 is an apocalyptic number.

31787041939 is a deficient number, since it is larger than the sum of its proper divisors (1).

31787041939 is an equidigital number, since it uses as much as digits as its factorization.

31787041939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1143072, while the sum is 52.

The spelling of 31787041939 in words is "thirty-one billion, seven hundred eighty-seven million, forty-one thousand, nine hundred thirty-nine".