31918875407 has 2 divisors, whose sum is σ = 31918875408. Its totient is φ = 31918875406.

The previous prime is 31918875403. The next prime is 31918875427. The reversal of 31918875407 is 70457881913.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31918875407 - 2² = 31918875403 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31918875403) 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, 15959437703 + 15959437704.

It is an arithmetic number, because the mean of its divisors is an integer number (15959437704).

Almost surely, 2^31918875407 is an apocalyptic number.

31918875407 is a deficient number, since it is larger than the sum of its proper divisors (1).

31918875407 is an equidigital number, since it uses as much as digits as its factorization.

31918875407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1693440, while the sum is 53.

The spelling of 31918875407 in words is "thirty-one billion, nine hundred eighteen million, eight hundred seventy-five thousand, four hundred seven".