31921987607 has 2 divisors, whose sum is σ = 31921987608. Its totient is φ = 31921987606.

The previous prime is 31921987567. The next prime is 31921987637. The reversal of 31921987607 is 70678912913.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31921987607 - 2⁶ = 31921987543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31921987637) 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, 15960993803 + 15960993804.

It is an arithmetic number, because the mean of its divisors is an integer number (15960993804).

Almost surely, 2^31921987607 is an apocalyptic number.

31921987607 is a deficient number, since it is larger than the sum of its proper divisors (1).

31921987607 is an equidigital number, since it uses as much as digits as its factorization.

31921987607 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 53.

The spelling of 31921987607 in words is "thirty-one billion, nine hundred twenty-one million, nine hundred eighty-seven thousand, six hundred seven".