31512170413 has 2 divisors, whose sum is σ = 31512170414. Its totient is φ = 31512170412.

The previous prime is 31512170383. The next prime is 31512170449. The reversal of 31512170413 is 31407121513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25843134564 + 5669035849 = 160758^2 + 75293^2 .

It is a cyclic number.

It is not a de Polignac number, because 31512170413 - 2²¹ = 31510073261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31512170113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15756085206 + 15756085207.

It is an arithmetic number, because the mean of its divisors is an integer number (15756085207).

Almost surely, 2^31512170413 is an apocalyptic number.

It is an amenable number.

31512170413 is a deficient number, since it is larger than the sum of its proper divisors (1).

31512170413 is an equidigital number, since it uses as much as digits as its factorization.

31512170413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 28.

Adding to 31512170413 its reverse (31407121513), we get a palindrome (62919291926).

The spelling of 31512170413 in words is "thirty-one billion, five hundred twelve million, one hundred seventy thousand, four hundred thirteen".