31873081 has 2 divisors, whose sum is σ = 31873082. Its totient is φ = 31873080.

The previous prime is 31873033. The next prime is 31873099. The reversal of 31873081 is 18037813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31866025 + 7056 = 5645^2 + 84^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31873081 is a prime.

It is a super-2 number, since 2×31873081² = 2031786584865122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31843081) 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, 15936540 + 15936541.

It is an arithmetic number, because the mean of its divisors is an integer number (15936541).

Almost surely, 2^31873081 is an apocalyptic number.

It is an amenable number.

31873081 is a deficient number, since it is larger than the sum of its proper divisors (1).

31873081 is an equidigital number, since it uses as much as digits as its factorization.

31873081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 31873081 is about 5645.6249432636. The cubic root of 31873081 is about 317.0599222636.

The spelling of 31873081 in words is "thirty-one million, eight hundred seventy-three thousand, eighty-one".