1315161491 has 4 divisors (see below), whose sum is σ = 1503041712. Its totient is φ = 1127281272.

The previous prime is 1315161481. The next prime is 1315161499. The reversal of 1315161491 is 1941615131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1941615131 = 21799 ⋅89069.

It is a cyclic number.

It is not a de Polignac number, because 1315161491 - 2¹⁴ = 1315145107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1315161499) 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, 93940100 + ... + 93940113.

It is an arithmetic number, because the mean of its divisors is an integer number (375760428).

Almost surely, 2^1315161491 is an apocalyptic number.

1315161491 is a deficient number, since it is larger than the sum of its proper divisors (187880221).

1315161491 is an equidigital number, since it uses as much as digits as its factorization.

1315161491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187880220.

The product of its digits is 3240, while the sum is 32.

The square root of 1315161491 is about 36265.1553284968. The cubic root of 1315161491 is about 1095.6193520142.

The spelling of 1315161491 in words is "one billion, three hundred fifteen million, one hundred sixty-one thousand, four hundred ninety-one".