11808688531 has 4 divisors (see below), whose sum is σ = 11827111464. Its totient is φ = 11790265600.

The previous prime is 11808688523. The next prime is 11808688607. The reversal of 11808688531 is 13588680811.

It is a happy number.

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 11808688531 - 2³ = 11808688523 is a prime.

It is a super-2 number, since 2×11808688531² (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 (11808688511) 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, 9210505 + ... + 9211786.

It is an arithmetic number, because the mean of its divisors is an integer number (2956777866).

Almost surely, 2^11808688531 is an apocalyptic number.

11808688531 is a deficient number, since it is larger than the sum of its proper divisors (18422933).

11808688531 is an equidigital number, since it uses as much as digits as its factorization.

11808688531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18422932.

The product of its (nonzero) digits is 368640, while the sum is 49.

The spelling of 11808688531 in words is "eleven billion, eight hundred eight million, six hundred eighty-eight thousand, five hundred thirty-one".