1373317257 has 8 divisors (see below), whose sum is σ = 1971942784. Its totient is φ = 845118288.

The previous prime is 1373317249. The next prime is 1373317261. The reversal of 1373317257 is 7527133731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1373317257 - 2³ = 1373317249 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 35213263 = 1373317257 / (1 + 3 + 7 + 3 + 3 + 1 + 7 + 2 + 5 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1373317457) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17606593 + ... + 17606670.

It is an arithmetic number, because the mean of its divisors is an integer number (246492848).

Almost surely, 2^1373317257 is an apocalyptic number.

It is an amenable number.

1373317257 is a deficient number, since it is larger than the sum of its proper divisors (598625527).

1373317257 is a wasteful number, since it uses less digits than its factorization.

1373317257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35213279.

The product of its digits is 92610, while the sum is 39.

The square root of 1373317257 is about 37058.2953871330. The cubic root of 1373317257 is about 1111.5362374508.

The spelling of 1373317257 in words is "one billion, three hundred seventy-three million, three hundred seventeen thousand, two hundred fifty-seven".