31795681 has 2 divisors, whose sum is σ = 31795682. Its totient is φ = 31795680.

The previous prime is 31795679. The next prime is 31795711. The reversal of 31795681 is 18659713.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23040000 + 8755681 = 4800^2 + 2959^2 .

It is a cyclic number.

It is not a de Polignac number, because 31795681 - 2¹ = 31795679 is a prime.

It is a super-2 number, since 2×31795681² = 2021930660507522, which contains 22 as substring.

Together with 31795679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31795651) 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, 15897840 + 15897841.

It is an arithmetic number, because the mean of its divisors is an integer number (15897841).

Almost surely, 2^31795681 is an apocalyptic number.

It is an amenable number.

31795681 is a deficient number, since it is larger than the sum of its proper divisors (1).

31795681 is an equidigital number, since it uses as much as digits as its factorization.

31795681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 40.

The square root of 31795681 is about 5638.7659110837. The cubic root of 31795681 is about 316.8030667545.

The spelling of 31795681 in words is "thirty-one million, seven hundred ninety-five thousand, six hundred eighty-one".