1312177631 has 4 divisors (see below), whose sum is σ = 1340096352. Its totient is φ = 1284258912.

The previous prime is 1312177619. The next prime is 1312177661. The reversal of 1312177631 is 1367712131.

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 1312177631 - 2²⁶ = 1245068767 is a prime.

It is a super-2 number, since 2×1312177631² = 3443620270593544322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312177661) 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, 13959290 + ... + 13959383.

It is an arithmetic number, because the mean of its divisors is an integer number (335024088).

Almost surely, 2^1312177631 is an apocalyptic number.

1312177631 is a deficient number, since it is larger than the sum of its proper divisors (27918721).

1312177631 is an equidigital number, since it uses as much as digits as its factorization.

1312177631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27918720.

The product of its digits is 5292, while the sum is 32.

The square root of 1312177631 is about 36223.9924773623. The cubic root of 1312177631 is about 1094.7901381904.

Adding to 1312177631 its reverse (1367712131), we get a palindrome (2679889762).

The spelling of 1312177631 in words is "one billion, three hundred twelve million, one hundred seventy-seven thousand, six hundred thirty-one".