31293013 has 2 divisors, whose sum is σ = 31293014. Its totient is φ = 31293012.

The previous prime is 31293007. The next prime is 31293029. The reversal of 31293013 is 31039213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31114084 + 178929 = 5578^2 + 423^2 .

It is a cyclic number.

It is not a de Polignac number, because 31293013 - 2¹³ = 31284821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31293313) 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, 15646506 + 15646507.

It is an arithmetic number, because the mean of its divisors is an integer number (15646507).

Almost surely, 2^31293013 is an apocalyptic number.

It is an amenable number.

31293013 is a deficient number, since it is larger than the sum of its proper divisors (1).

31293013 is an equidigital number, since it uses as much as digits as its factorization.

31293013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 31293013 is about 5594.0158204996. The cubic root of 31293013 is about 315.1247108446.

The spelling of 31293013 in words is "thirty-one million, two hundred ninety-three thousand, thirteen".