31900553 has 2 divisors, whose sum is σ = 31900554. Its totient is φ = 31900552.

The previous prime is 31900543. The next prime is 31900559. The reversal of 31900553 is 35500913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31393609 + 506944 = 5603^2 + 712^2 .

It is a cyclic number.

It is not a de Polignac number, because 31900553 - 2¹² = 31896457 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31900559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15950276 + 15950277.

It is an arithmetic number, because the mean of its divisors is an integer number (15950277).

Almost surely, 2^31900553 is an apocalyptic number.

It is an amenable number.

31900553 is a deficient number, since it is larger than the sum of its proper divisors (1).

31900553 is an equidigital number, since it uses as much as digits as its factorization.

31900553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2025, while the sum is 26.

The square root of 31900553 is about 5648.0574536738. The cubic root of 31900553 is about 317.1509893814.

The spelling of 31900553 in words is "thirty-one million, nine hundred thousand, five hundred fifty-three".