11947931 has 2 divisors, whose sum is σ = 11947932. Its totient is φ = 11947930.

The previous prime is 11947891. The next prime is 11947961. The reversal of 11947931 is 13974911.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (13974911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11947931 - 2¹⁴ = 11931547 is a prime.

It is a super-2 number, since 2×11947931² = 285506110361522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11947891 and 11947900.

It is not a weakly prime, because it can be changed into another prime (11947961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5973965 + 5973966.

It is an arithmetic number, because the mean of its divisors is an integer number (5973966).

Almost surely, 2^11947931 is an apocalyptic number.

11947931 is a deficient number, since it is larger than the sum of its proper divisors (1).

11947931 is an equidigital number, since it uses as much as digits as its factorization.

11947931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 35.

The square root of 11947931 is about 3456.5779320015. The cubic root of 11947931 is about 228.6112343806.

The spelling of 11947931 in words is "eleven million, nine hundred forty-seven thousand, nine hundred thirty-one".