31882681 has 2 divisors, whose sum is σ = 31882682. Its totient is φ = 31882680.

The previous prime is 31882679. The next prime is 31882693. The reversal of 31882681 is 18628813.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27405225 + 4477456 = 5235^2 + 2116^2 .

It is a cyclic number.

It is not a de Polignac number, because 31882681 - 2¹ = 31882679 is a prime.

It is a super-2 number, since 2×31882681² = 2033010695495522, which contains 22 as substring.

Together with 31882679, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 31882681.

It is not a weakly prime, because it can be changed into another prime (31882661) 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, 15941340 + 15941341.

It is an arithmetic number, because the mean of its divisors is an integer number (15941341).

Almost surely, 2^31882681 is an apocalyptic number.

It is an amenable number.

31882681 is a deficient number, since it is larger than the sum of its proper divisors (1).

31882681 is an equidigital number, since it uses as much as digits as its factorization.

31882681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18432, while the sum is 37.

The square root of 31882681 is about 5646.4750951368. The cubic root of 31882681 is about 317.0917513141.

The spelling of 31882681 in words is "thirty-one million, eight hundred eighty-two thousand, six hundred eighty-one".