11511542031 has 12 divisors (see below), whose sum is σ = 16870910616. Its totient is φ = 6976691920.

The previous prime is 11511542023. The next prime is 11511542033. The reversal of 11511542031 is 13024511511.

It is not a de Polignac number, because 11511542031 - 2³ = 11511542023 is a prime.

It is a super-2 number, since 2×11511542031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11511541992 and 11511542010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11511542033) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15855756 + ... + 15856481.

It is an arithmetic number, because the mean of its divisors is an integer number (1405909218).

Almost surely, 2^11511542031 is an apocalyptic number.

11511542031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11511542031 is a deficient number, since it is larger than the sum of its proper divisors (5359368585).

11511542031 is a wasteful number, since it uses less digits than its factorization.

11511542031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31712262 (or 31712251 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 24.

The spelling of 11511542031 in words is "eleven billion, five hundred eleven million, five hundred forty-two thousand, thirty-one".