31213392624509 has 2 divisors, whose sum is σ = 31213392624510. Its totient is φ = 31213392624508.

The previous prime is 31213392624461. The next prime is 31213392624521. The reversal of 31213392624509 is 90542629331213.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19455200748025 + 11758191876484 = 4410805^2 + 3429022^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31213392624509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31213392629509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606696312254 + 15606696312255.

It is an arithmetic number, because the mean of its divisors is an integer number (15606696312255).

Almost surely, 2^{31213392624509} is an apocalyptic number.

It is an amenable number.

31213392624509 is a deficient number, since it is larger than the sum of its proper divisors (1).

31213392624509 is an equidigital number, since it uses as much as digits as its factorization.

31213392624509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2099520, while the sum is 50.

The spelling of 31213392624509 in words is "thirty-one trillion, two hundred thirteen billion, three hundred ninety-two million, six hundred twenty-four thousand, five hundred nine".