1312012131 has 4 divisors (see below), whose sum is σ = 1749349512. Its totient is φ = 874674752.

The previous prime is 1312012129. The next prime is 1312012133. The reversal of 1312012131 is 1312102131.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (1312012129) and next prime (1312012133).

It is a cyclic number.

It is not a de Polignac number, because 1312012131 - 2¹ = 1312012129 is a prime.

It is a super-2 number, since 2×1312012131² = 3442751663782322322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1312012131.

It is not an unprimeable number, because it can be changed into a prime (1312012133) 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, 218668686 + ... + 218668691.

It is an arithmetic number, because the mean of its divisors is an integer number (437337378).

Almost surely, 2^1312012131 is an apocalyptic number.

1312012131 is a deficient number, since it is larger than the sum of its proper divisors (437337381).

1312012131 is an equidigital number, since it uses as much as digits as its factorization.

1312012131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437337380.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1312012131 is about 36221.7080077679. The cubic root of 1312012131 is about 1094.7441090092.

Adding to 1312012131 its reverse (1312102131), we get a palindrome (2624114262).

Subtracting 1312012131 from its reverse (1312102131), we obtain a square (90000 = 300²).

The spelling of 1312012131 in words is "one billion, three hundred twelve million, twelve thousand, one hundred thirty-one".