15713257 has 4 divisors (see below), whose sum is σ = 17958016. Its totient is φ = 13468500.

The previous prime is 15713251. The next prime is 15713263. The reversal of 15713257 is 75231751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (15713251) and next prime (15713263).

It is a cyclic number.

It is not a de Polignac number, because 15713257 - 2¹⁹ = 15188969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15713251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1122369 + ... + 1122382.

It is an arithmetic number, because the mean of its divisors is an integer number (4489504).

Almost surely, 2^15713257 is an apocalyptic number.

It is an amenable number.

15713257 is a deficient number, since it is larger than the sum of its proper divisors (2244759).

15713257 is an equidigital number, since it uses as much as digits as its factorization.

15713257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2244758.

The product of its digits is 7350, while the sum is 31.

The square root of 15713257 is about 3963.9950807235. The cubic root of 15713257 is about 250.4698205216.

The spelling of 15713257 in words is "fifteen million, seven hundred thirteen thousand, two hundred fifty-seven".