13215631357 has 2 divisors, whose sum is σ = 13215631358. Its totient is φ = 13215631356.

The previous prime is 13215631349. The next prime is 13215631381. The reversal of 13215631357 is 75313651231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12503488761 + 712142596 = 111819^2 + 26686^2 .

It is a cyclic number.

It is not a de Polignac number, because 13215631357 - 2³ = 13215631349 is a prime.

It is a super-2 number, since 2×13215631357² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13215631337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6607815678 + 6607815679.

It is an arithmetic number, because the mean of its divisors is an integer number (6607815679).

Almost surely, 2^13215631357 is an apocalyptic number.

It is an amenable number.

13215631357 is a deficient number, since it is larger than the sum of its proper divisors (1).

13215631357 is an equidigital number, since it uses as much as digits as its factorization.

13215631357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56700, while the sum is 37.

The spelling of 13215631357 in words is "thirteen billion, two hundred fifteen million, six hundred thirty-one thousand, three hundred fifty-seven".