31670761 has 2 divisors, whose sum is σ = 31670762. Its totient is φ = 31670760.

The previous prime is 31670759. The next prime is 31670767. The reversal of 31670761 is 16707613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31136400 + 534361 = 5580^2 + 731^2 .

It is a cyclic number.

It is not a de Polignac number, because 31670761 - 2¹ = 31670759 is a prime.

Together with 31670759, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31670767) 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, 15835380 + 15835381.

It is an arithmetic number, because the mean of its divisors is an integer number (15835381).

Almost surely, 2^31670761 is an apocalyptic number.

It is an amenable number.

31670761 is a deficient number, since it is larger than the sum of its proper divisors (1).

31670761 is an equidigital number, since it uses as much as digits as its factorization.

31670761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 31670761 is about 5627.6781180163. The cubic root of 31670761 is about 316.3876331777.

The spelling of 31670761 in words is "thirty-one million, six hundred seventy thousand, seven hundred sixty-one".