15972791 has 2 divisors, whose sum is σ = 15972792. Its totient is φ = 15972790.

The previous prime is 15972743. The next prime is 15972793. The reversal of 15972791 is 19727951.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15972791 - 2¹⁸ = 15710647 is a prime.

Together with 15972793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15972793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7986395 + 7986396.

It is an arithmetic number, because the mean of its divisors is an integer number (7986396).

Almost surely, 2^15972791 is an apocalyptic number.

15972791 is a deficient number, since it is larger than the sum of its proper divisors (1).

15972791 is an equidigital number, since it uses as much as digits as its factorization.

15972791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39690, while the sum is 41.

The square root of 15972791 is about 3996.5974278128. The cubic root of 15972791 is about 251.8412906345.

The spelling of 15972791 in words is "fifteen million, nine hundred seventy-two thousand, seven hundred ninety-one".