1315857993 has 8 divisors (see below), whose sum is σ = 1770004128. Its totient is φ = 869475264.

The previous prime is 1315857971. The next prime is 1315858001. The reversal of 1315857993 is 3997585131.

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

It is not a de Polignac number, because 1315857993 - 2¹⁷ = 1315726921 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1315857913) 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, 1940455 + ... + 1941132.

It is an arithmetic number, because the mean of its divisors is an integer number (221250516).

Almost surely, 2^1315857993 is an apocalyptic number.

It is an amenable number.

1315857993 is a deficient number, since it is larger than the sum of its proper divisors (454146135).

1315857993 is a wasteful number, since it uses less digits than its factorization.

1315857993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3881703.

The product of its digits is 1020600, while the sum is 51.

The square root of 1315857993 is about 36274.7569667944. The cubic root of 1315857993 is about 1095.8127291276.

The spelling of 1315857993 in words is "one billion, three hundred fifteen million, eight hundred fifty-seven thousand, nine hundred ninety-three".