1315727657 has 4 divisors (see below), whose sum is σ = 1316104020. Its totient is φ = 1315351296.

The previous prime is 1315727617. The next prime is 1315727701. The reversal of 1315727657 is 7567275131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 111915241 + 1203812416 = 10579^2 + 34696^2 .

It is a cyclic number.

It is not a de Polignac number, because 1315727657 - 2¹² = 1315723561 is a prime.

It is a super-2 number, since 2×1315727657² = 3462278534789419298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1315727617) 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, 182888 + ... + 189945.

It is an arithmetic number, because the mean of its divisors is an integer number (329026005).

Almost surely, 2^1315727657 is an apocalyptic number.

It is an amenable number.

1315727657 is a deficient number, since it is larger than the sum of its proper divisors (376363).

1315727657 is an equidigital number, since it uses as much as digits as its factorization.

1315727657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376362.

The product of its digits is 308700, while the sum is 44.

The square root of 1315727657 is about 36272.9604113036. The cubic root of 1315727657 is about 1095.7765477756.

The spelling of 1315727657 in words is "one billion, three hundred fifteen million, seven hundred twenty-seven thousand, six hundred fifty-seven".