1315831511 has 4 divisors (see below), whose sum is σ = 1338133800. Its totient is φ = 1293529224.

The previous prime is 1315831507. The next prime is 1315831513. The reversal of 1315831511 is 1151385131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1151385131 = 13 ⋅88568087.

It is a cyclic number.

It is not a de Polignac number, because 1315831511 - 2² = 1315831507 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1315831513) 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, 11151056 + ... + 11151173.

It is an arithmetic number, because the mean of its divisors is an integer number (334533450).

Almost surely, 2^1315831511 is an apocalyptic number.

1315831511 is a deficient number, since it is larger than the sum of its proper divisors (22302289).

1315831511 is an equidigital number, since it uses as much as digits as its factorization.

1315831511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22302288.

The product of its digits is 1800, while the sum is 29.

The square root of 1315831511 is about 36274.3919452828. The cubic root of 1315831511 is about 1095.8053779019.

The spelling of 1315831511 in words is "one billion, three hundred fifteen million, eight hundred thirty-one thousand, five hundred eleven".