1312131402 has 12 divisors (see below), whose sum is σ = 2842951410. Its totient is φ = 437377128.

The previous prime is 1312131377. The next prime is 1312131409. The reversal of 1312131402 is 2041312131.

1312131402 is a `hidden beast` number, since 131 + 2 + 131 + 402 = 666.

It can be written as a sum of positive squares in only one way, i.e., 700607961 + 611523441 = 26469^2 + 24729^2 .

It is a super-2 number, since 2×1312131402² = 3443377632228971208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 72896189 = 1312131402 / (1 + 3 + 1 + 2 + 1 + 3 + 1 + 4 + 0 + 2).

It is not an unprimeable number, because it can be changed into a prime (1312131409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36448077 + ... + 36448112.

Almost surely, 2^1312131402 is an apocalyptic number.

1312131402 is an abundant number, since it is smaller than the sum of its proper divisors (1530820008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1312131402 is a wasteful number, since it uses less digits than its factorization.

1312131402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72896197 (or 72896194 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1312131402 is about 36223.3543725591. The cubic root of 1312131402 is about 1094.7772812808. Note that the first 3 decimals are identical.

Adding to 1312131402 its reverse (2041312131), we get a palindrome (3353443533).

The spelling of 1312131402 in words is "one billion, three hundred twelve million, one hundred thirty-one thousand, four hundred two".