11111013131 has 4 divisors (see below), whose sum is σ = 11221023264. Its totient is φ = 11001003000.

The previous prime is 11111013127. The next prime is 11111013143. The reversal of 11111013131 is 13131011111.

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

It is a cyclic number.

It is not a de Polignac number, because 11111013131 - 2² = 11111013127 is a prime.

It is a super-2 number, since 2×11111013131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111013191) 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, 55004915 + ... + 55005116.

It is an arithmetic number, because the mean of its divisors is an integer number (2805255816).

Almost surely, 2^11111013131 is an apocalyptic number.

11111013131 is a deficient number, since it is larger than the sum of its proper divisors (110010133).

11111013131 is a wasteful number, since it uses less digits than its factorization.

11111013131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110010132.

The product of its (nonzero) digits is 9, while the sum is 14.

Adding to 11111013131 its reverse (13131011111), we get a palindrome (24242024242).

The spelling of 11111013131 in words is "eleven billion, one hundred eleven million, thirteen thousand, one hundred thirty-one".