15312091 has 2 divisors, whose sum is σ = 15312092. Its totient is φ = 15312090.

The previous prime is 15312049. The next prime is 15312097. The reversal of 15312091 is 19021351.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15312091 - 2⁹ = 15311579 is a prime.

It is not a weakly prime, because it can be changed into another prime (15312097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7656045 + 7656046.

It is an arithmetic number, because the mean of its divisors is an integer number (7656046).

Almost surely, 2^15312091 is an apocalyptic number.

15312091 is a deficient number, since it is larger than the sum of its proper divisors (1).

15312091 is an equidigital number, since it uses as much as digits as its factorization.

15312091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270, while the sum is 22.

The square root of 15312091 is about 3913.0667001726. The cubic root of 15312091 is about 248.3198861638.

The spelling of 15312091 in words is "fifteen million, three hundred twelve thousand, ninety-one".