1312132521 has 32 divisors (see below), whose sum is σ = 2073600000. Its totient is φ = 722111040.

The previous prime is 1312132499. The next prime is 1312132537. The reversal of 1312132521 is 1252312131.

It is not a de Polignac number, because 1312132521 - 2¹⁰ = 1312131497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1312132541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 259980 + ... + 264978.

It is an arithmetic number, because the mean of its divisors is an integer number (64800000).

Almost surely, 2^1312132521 is an apocalyptic number.

It is an amenable number.

1312132521 is a deficient number, since it is larger than the sum of its proper divisors (761467479).

1312132521 is a wasteful number, since it uses less digits than its factorization.

1312132521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5469.

The product of its digits is 360, while the sum is 21.

The square root of 1312132521 is about 36223.3698183921. The cubic root of 1312132521 is about 1094.7775924934. Note that the first 3 decimals are identical.

Adding to 1312132521 its reverse (1252312131), we get a palindrome (2564444652).

The spelling of 1312132521 in words is "one billion, three hundred twelve million, one hundred thirty-two thousand, five hundred twenty-one".