11513143531 has 4 divisors (see below), whose sum is σ = 11513501352. Its totient is φ = 11512785712.

The previous prime is 11513143501. The next prime is 11513143549. The reversal of 11513143531 is 13534131511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11513143531 is a prime.

It is a super-2 number, since 2×11513143531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11513143531.

It is not an unprimeable number, because it can be changed into a prime (11513143501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125290 + ... + 196783.

It is an arithmetic number, because the mean of its divisors is an integer number (2878375338).

Almost surely, 2^11513143531 is an apocalyptic number.

11513143531 is a deficient number, since it is larger than the sum of its proper divisors (357821).

11513143531 is an equidigital number, since it uses as much as digits as its factorization.

11513143531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357820.

The product of its digits is 2700, while the sum is 28.

The spelling of 11513143531 in words is "eleven billion, five hundred thirteen million, one hundred forty-three thousand, five hundred thirty-one".