11990931 has 4 divisors (see below), whose sum is σ = 15987912. Its totient is φ = 7993952.

The previous prime is 11990921. The next prime is 11990939. The reversal of 11990931 is 13909911.

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 11990931 - 2¹⁹ = 11466643 is a prime.

It is a super-2 number, since 2×11990931² = 287564852493522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11990892 and 11990901.

It is not an unprimeable number, because it can be changed into a prime (11990939) 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, 1998486 + ... + 1998491.

It is an arithmetic number, because the mean of its divisors is an integer number (3996978).

Almost surely, 2^11990931 is an apocalyptic number.

11990931 is a deficient number, since it is larger than the sum of its proper divisors (3996981).

11990931 is an equidigital number, since it uses as much as digits as its factorization.

11990931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3996980.

The product of its (nonzero) digits is 2187, while the sum is 33.

The square root of 11990931 is about 3462.7923703277. The cubic root of 11990931 is about 228.8851594561.

It can be divided in two parts, 11990 and 931, that added together give a palindrome (12921).

The spelling of 11990931 in words is "eleven million, nine hundred ninety thousand, nine hundred thirty-one".