31294771213 has 2 divisors, whose sum is σ = 31294771214. Its totient is φ = 31294771212.

The previous prime is 31294771169. The next prime is 31294771229. The reversal of 31294771213 is 31217749213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16878686724 + 14416084489 = 129918^2 + 120067^2 .

It is a cyclic number.

It is not a de Polignac number, because 31294771213 - 2¹⁷ = 31294640141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31294771913) 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, 15647385606 + 15647385607.

It is an arithmetic number, because the mean of its divisors is an integer number (15647385607).

Almost surely, 2^31294771213 is an apocalyptic number.

It is an amenable number.

31294771213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31294771213 is an equidigital number, since it uses as much as digits as its factorization.

31294771213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 40.

The spelling of 31294771213 in words is "thirty-one billion, two hundred ninety-four million, seven hundred seventy-one thousand, two hundred thirteen".