12219931 has 2 divisors, whose sum is σ = 12219932. Its totient is φ = 12219930.

The previous prime is 12219919. The next prime is 12219973. The reversal of 12219931 is 13991221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12219931 - 2⁷ = 12219803 is a prime.

It is a super-2 number, since 2×12219931² = 298653427289522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12219931.

It is not a weakly prime, because it can be changed into another prime (12219901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6109965 + 6109966.

It is an arithmetic number, because the mean of its divisors is an integer number (6109966).

Almost surely, 2^12219931 is an apocalyptic number.

12219931 is a deficient number, since it is larger than the sum of its proper divisors (1).

12219931 is an equidigital number, since it uses as much as digits as its factorization.

12219931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 28.

The square root of 12219931 is about 3495.7017893407. The cubic root of 12219931 is about 230.3330461779. Note that the first 3 decimals are identical.

The spelling of 12219931 in words is "twelve million, two hundred nineteen thousand, nine hundred thirty-one".