1315775131 has 12 divisors (see below), whose sum is σ = 1444374360. Its totient is φ = 1188719360.

The previous prime is 1315775119. The next prime is 1315775143.

1315775131 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (1315775119) and next prime (1315775143).

It is a de Polignac number, because none of the positive numbers 2^k-1315775131 is a prime.

It is a super-2 number, since 2×1315775131² = 3462528390716134322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1315775431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 304635 + ... + 308923.

It is an arithmetic number, because the mean of its divisors is an integer number (120364530).

Almost surely, 2^1315775131 is an apocalyptic number.

1315775131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1315775131 is a deficient number, since it is larger than the sum of its proper divisors (128599229).

1315775131 is an equidigital number, since it uses as much as digits as its factorization.

1315775131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4634 (or 4467 counting only the distinct ones).

The product of its digits is 11025, while the sum is 34.

The square root of 1315775131 is about 36273.6148047034. The cubic root of 1315775131 is about 1095.7897268632.

It can be divided in two parts, 13157 and 75131, that added together give a palindrome (88288).

The spelling of 1315775131 in words is "one billion, three hundred fifteen million, seven hundred seventy-five thousand, one hundred thirty-one".