31982081 has 2 divisors, whose sum is σ = 31982082. Its totient is φ = 31982080.

The previous prime is 31982063. The next prime is 31982087. The reversal of 31982081 is 18028913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31181056 + 801025 = 5584^2 + 895^2 .

It is a cyclic number.

It is not a de Polignac number, because 31982081 - 2¹⁴ = 31965697 is a prime.

It is a super-2 number, since 2×31982081² = 2045707010181122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31982087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15991040 + 15991041.

It is an arithmetic number, because the mean of its divisors is an integer number (15991041).

Almost surely, 2^31982081 is an apocalyptic number.

It is an amenable number.

31982081 is a deficient number, since it is larger than the sum of its proper divisors (1).

31982081 is an equidigital number, since it uses as much as digits as its factorization.

31982081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 31982081 is about 5655.2701969048. The cubic root of 31982081 is about 317.4209396635.

The spelling of 31982081 in words is "thirty-one million, nine hundred eighty-two thousand, eighty-one".