15715897 has 2 divisors, whose sum is σ = 15715898. Its totient is φ = 15715896.

The previous prime is 15715879. The next prime is 15715901. The reversal of 15715897 is 79851751.

Together with previous prime (15715879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15713296 + 2601 = 3964^2 + 51^2 .

It is a cyclic number.

It is not a de Polignac number, because 15715897 - 2¹¹ = 15713849 is a prime.

It is not a weakly prime, because it can be changed into another prime (15715697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7857948 + 7857949.

It is an arithmetic number, because the mean of its divisors is an integer number (7857949).

Almost surely, 2^15715897 is an apocalyptic number.

It is an amenable number.

15715897 is a deficient number, since it is larger than the sum of its proper divisors (1).

15715897 is an equidigital number, since it uses as much as digits as its factorization.

15715897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 88200, while the sum is 43.

The square root of 15715897 is about 3964.3280641239. The cubic root of 15715897 is about 250.4838469643.

The spelling of 15715897 in words is "fifteen million, seven hundred fifteen thousand, eight hundred ninety-seven".