12291791 has 2 divisors, whose sum is σ = 12291792. Its totient is φ = 12291790.

The previous prime is 12291767. The next prime is 12291793. The reversal of 12291791 is 19719221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12291791 - 2¹⁴ = 12275407 is a prime.

Together with 12291793, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₈₀₅₉₁₉ and since 12291791 and 805919 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12291793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6145895 + 6145896.

It is an arithmetic number, because the mean of its divisors is an integer number (6145896).

Almost surely, 2^12291791 is an apocalyptic number.

12291791 is a deficient number, since it is larger than the sum of its proper divisors (1).

12291791 is an equidigital number, since it uses as much as digits as its factorization.

12291791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 32.

The square root of 12291791 is about 3505.9650597232. The cubic root of 12291791 is about 230.7836595736.

The spelling of 12291791 in words is "twelve million, two hundred ninety-one thousand, seven hundred ninety-one".