1315161511 has 4 divisors (see below), whose sum is σ = 1315743912. Its totient is φ = 1314579112.

The previous prime is 1315161499. The next prime is 1315161517. The reversal of 1315161511 is 1151615131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1151615131 = 3547 ⋅324673.

It is a cyclic number.

It is not a de Polignac number, because 1315161511 - 2⁷ = 1315161383 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 (1315161517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287800 + ... + 292333.

It is an arithmetic number, because the mean of its divisors is an integer number (328935978).

Almost surely, 2^1315161511 is an apocalyptic number.

1315161511 is a deficient number, since it is larger than the sum of its proper divisors (582401).

1315161511 is an equidigital number, since it uses as much as digits as its factorization.

1315161511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582400.

The product of its digits is 450, while the sum is 25.

The square root of 1315161511 is about 36265.1556042436. The cubic root of 1315161511 is about 1095.6193575680.

Adding to 1315161511 its reverse (1151615131), we get a palindrome (2466776642).

The spelling of 1315161511 in words is "one billion, three hundred fifteen million, one hundred sixty-one thousand, five hundred eleven".