31890625037 has 2 divisors, whose sum is σ = 31890625038. Its totient is φ = 31890625036.

The previous prime is 31890624973. The next prime is 31890625051. The reversal of 31890625037 is 73052609813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25096579561 + 6794045476 = 158419^2 + 82426^2 .

It is a cyclic number.

It is not a de Polignac number, because 31890625037 - 2⁶ = 31890624973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31890625237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15945312518 + 15945312519.

It is an arithmetic number, because the mean of its divisors is an integer number (15945312519).

Almost surely, 2^31890625037 is an apocalyptic number.

It is an amenable number.

31890625037 is a deficient number, since it is larger than the sum of its proper divisors (1).

31890625037 is an equidigital number, since it uses as much as digits as its factorization.

31890625037 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 44.

The spelling of 31890625037 in words is "thirty-one billion, eight hundred ninety million, six hundred twenty-five thousand, thirty-seven".