31761013 has 2 divisors, whose sum is σ = 31761014. Its totient is φ = 31761012.

The previous prime is 31761007. The next prime is 31761071. The reversal of 31761013 is 31016713.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31618129 + 142884 = 5623^2 + 378^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31761013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31761113) 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, 15880506 + 15880507.

It is an arithmetic number, because the mean of its divisors is an integer number (15880507).

Almost surely, 2^31761013 is an apocalyptic number.

It is an amenable number.

31761013 is a deficient number, since it is larger than the sum of its proper divisors (1).

31761013 is an equidigital number, since it uses as much as digits as its factorization.

31761013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 31761013 is about 5635.6909957875. The cubic root of 31761013 is about 316.6878842047.

Adding to 31761013 its reverse (31016713), we get a palindrome (62777726).

The spelling of 31761013 in words is "thirty-one million, seven hundred sixty-one thousand, thirteen".