31883897 has 2 divisors, whose sum is σ = 31883898. Its totient is φ = 31883896.

The previous prime is 31883861. The next prime is 31883921. The reversal of 31883897 is 79838813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16289296 + 15594601 = 4036^2 + 3949^2 .

It is a cyclic number.

It is not a de Polignac number, because 31883897 - 2⁸ = 31883641 is a prime.

It is not a weakly prime, because it can be changed into another prime (31883837) 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, 15941948 + 15941949.

It is an arithmetic number, because the mean of its divisors is an integer number (15941949).

Almost surely, 2^31883897 is an apocalyptic number.

It is an amenable number.

31883897 is a deficient number, since it is larger than the sum of its proper divisors (1).

31883897 is an equidigital number, since it uses as much as digits as its factorization.

31883897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 47.

The square root of 31883897 is about 5646.5827719073. The cubic root of 31883897 is about 317.0957825379.

The spelling of 31883897 in words is "thirty-one million, eight hundred eighty-three thousand, eight hundred ninety-seven".