11611756231 has 4 divisors (see below), whose sum is σ = 11629703952. Its totient is φ = 11593808512.

The previous prime is 11611756229. The next prime is 11611756243. The reversal of 11611756231 is 13265711611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13265711611 = 31 ⋅427926181.

It is a cyclic number.

It is not a de Polignac number, because 11611756231 - 2¹ = 11611756229 is a prime.

It is a super-2 number, since 2×11611756231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11611756271) 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, 8972890 + ... + 8974183.

It is an arithmetic number, because the mean of its divisors is an integer number (2907425988).

Almost surely, 2^11611756231 is an apocalyptic number.

11611756231 is a deficient number, since it is larger than the sum of its proper divisors (17947721).

11611756231 is an equidigital number, since it uses as much as digits as its factorization.

11611756231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17947720.

The product of its digits is 7560, while the sum is 34.

The spelling of 11611756231 in words is "eleven billion, six hundred eleven million, seven hundred fifty-six thousand, two hundred thirty-one".