11513215131 has 16 divisors (see below), whose sum is σ = 16748773248. Its totient is φ = 6976756800.

The previous prime is 11513215117. The next prime is 11513215177. The reversal of 11513215131 is 13151231511.

It is not a de Polignac number, because 11513215131 - 2¹¹ = 11513213083 is a prime.

It is a super-2 number, since 2×11513215131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11513205131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 280815 + ... + 319191.

It is an arithmetic number, because the mean of its divisors is an integer number (1046798328).

Almost surely, 2^11513215131 is an apocalyptic number.

11513215131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11513215131 is a deficient number, since it is larger than the sum of its proper divisors (5235558117).

11513215131 is a wasteful number, since it uses less digits than its factorization.

11513215131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47482.

The product of its digits is 450, while the sum is 24.

Adding to 11513215131 its reverse (13151231511), we get a palindrome (24664446642).

The spelling of 11513215131 in words is "eleven billion, five hundred thirteen million, two hundred fifteen thousand, one hundred thirty-one".