12291817 has 2 divisors, whose sum is σ = 12291818. Its totient is φ = 12291816.

The previous prime is 12291809. The next prime is 12291827. The reversal of 12291817 is 71819221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7750656 + 4541161 = 2784^2 + 2131^2 .

It is a cyclic number.

It is not a de Polignac number, because 12291817 - 2³ = 12291809 is a prime.

It is a super-2 number, since 2×12291817² = 302177530322978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12291827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6145908 + 6145909.

It is an arithmetic number, because the mean of its divisors is an integer number (6145909).

Almost surely, 2^12291817 is an apocalyptic number.

It is an amenable number.

12291817 is a deficient number, since it is larger than the sum of its proper divisors (1).

12291817 is an equidigital number, since it uses as much as digits as its factorization.

12291817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 31.

The square root of 12291817 is about 3505.9687676875. The cubic root of 12291817 is about 230.7838222939.

The spelling of 12291817 in words is "twelve million, two hundred ninety-one thousand, eight hundred seventeen".