13515231287 has 2 divisors, whose sum is σ = 13515231288. Its totient is φ = 13515231286.

The previous prime is 13515231269. The next prime is 13515231329. The reversal of 13515231287 is 78213251531.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13515231287 - 2¹⁰ = 13515230263 is a prime.

It is a super-2 number, since 2×13515231287² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13515231287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13515251287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6757615643 + 6757615644.

It is an arithmetic number, because the mean of its divisors is an integer number (6757615644).

Almost surely, 2^13515231287 is an apocalyptic number.

13515231287 is a deficient number, since it is larger than the sum of its proper divisors (1).

13515231287 is an equidigital number, since it uses as much as digits as its factorization.

13515231287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 38.

The spelling of 13515231287 in words is "thirteen billion, five hundred fifteen million, two hundred thirty-one thousand, two hundred eighty-seven".