11971931 has 8 divisors (see below), whose sum is σ = 12344640. Its totient is φ = 11603592.

The previous prime is 11971913. The next prime is 11971943. The reversal of 11971931 is 13917911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11971931 is a prime.

It is a super-2 number, since 2×11971931² = 286654263737522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11971901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4976 + ... + 6978.

It is an arithmetic number, because the mean of its divisors is an integer number (1543080).

Almost surely, 2^11971931 is an apocalyptic number.

11971931 is a deficient number, since it is larger than the sum of its proper divisors (372709).

11971931 is a wasteful number, since it uses less digits than its factorization.

11971931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2185.

The product of its digits is 1701, while the sum is 32.

The square root of 11971931 is about 3460.0478320393. The cubic root of 11971931 is about 228.7642036827.

The spelling of 11971931 in words is "eleven million, nine hundred seventy-one thousand, nine hundred thirty-one".