1315657 has 4 divisors (see below), whose sum is σ = 1503616. Its totient is φ = 1127700.

The previous prime is 1315651. The next prime is 1315661. The reversal of 1315657 is 7565131.

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 a de Polignac number, because none of the positive numbers 2^k-1315657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1315651) 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, 93969 + ... + 93982.

It is an arithmetic number, because the mean of its divisors is an integer number (375904).

2^1315657 is an apocalyptic number.

It is an amenable number.

1315657 is a deficient number, since it is larger than the sum of its proper divisors (187959).

1315657 is an equidigital number, since it uses as much as digits as its factorization.

1315657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187958.

The product of its digits is 3150, while the sum is 28.

The square root of 1315657 is about 1147.0209239591. The cubic root of 1315657 is about 109.5756932351.

It can be divided in two parts, 1315 and 657, that multiplied together give a triangular number (863955 = T₁₃₁₄).

The spelling of 1315657 in words is "one million, three hundred fifteen thousand, six hundred fifty-seven".