1312132015 has 4 divisors (see below), whose sum is σ = 1574558424. Its totient is φ = 1049705608.

The previous prime is 1312132013. The next prime is 1312132033. The reversal of 1312132015 is 5102312131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1312132015 - 2¹ = 1312132013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1312131983 and 1312132001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312132013) 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, 131213197 + ... + 131213206.

It is an arithmetic number, because the mean of its divisors is an integer number (393639606).

Almost surely, 2^1312132015 is an apocalyptic number.

1312132015 is a deficient number, since it is larger than the sum of its proper divisors (262426409).

1312132015 is an equidigital number, since it uses as much as digits as its factorization.

1312132015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262426408.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 1312132015 is about 36223.3628339501. The cubic root of 1312132015 is about 1094.7774517664. Note that the first 3 decimals are identical.

Adding to 1312132015 its reverse (5102312131), we get a palindrome (6414444146).

The spelling of 1312132015 in words is "one billion, three hundred twelve million, one hundred thirty-two thousand, fifteen".