11691931 has 4 divisors (see below), whose sum is σ = 11883664. Its totient is φ = 11500200.

The previous prime is 11691923. The next prime is 11691941. The reversal of 11691931 is 13919611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13919611 = 137 ⋅101603.

It is a cyclic number.

It is not a de Polignac number, because 11691931 - 2³ = 11691923 is a prime.

It is a super-2 number, since 2×11691931² = 273402501017522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11691893 and 11691902.

It is not an unprimeable number, because it can be changed into a prime (11691941) 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, 95775 + ... + 95896.

It is an arithmetic number, because the mean of its divisors is an integer number (2970916).

Almost surely, 2^11691931 is an apocalyptic number.

11691931 is a deficient number, since it is larger than the sum of its proper divisors (191733).

11691931 is an equidigital number, since it uses as much as digits as its factorization.

11691931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191732.

The product of its digits is 1458, while the sum is 31.

The square root of 11691931 is about 3419.3465750052. The cubic root of 11691931 is about 226.9666675944.

The spelling of 11691931 in words is "eleven million, six hundred ninety-one thousand, nine hundred thirty-one".