1312003131 has 4 divisors (see below), whose sum is σ = 1749337512. Its totient is φ = 874668752.

The previous prime is 1312003127. The next prime is 1312003151. The reversal of 1312003131 is 1313002131.

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 1312003131 - 2² = 1312003127 is a prime.

It is a super-2 number, since 2×1312003131² = 3442704431507606322, 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 1312003131.

It is not an unprimeable number, because it can be changed into a prime (1312003151) 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, 218667186 + ... + 218667191.

It is an arithmetic number, because the mean of its divisors is an integer number (437334378).

Almost surely, 2^1312003131 is an apocalyptic number.

1312003131 is a deficient number, since it is larger than the sum of its proper divisors (437334381).

1312003131 is an equidigital number, since it uses as much as digits as its factorization.

1312003131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437334380.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 1312003131 is about 36221.5837726624. The cubic root of 1312003131 is about 1094.7416058008.

Adding to 1312003131 its reverse (1313002131), we get a palindrome (2625005262).

The spelling of 1312003131 in words is "one billion, three hundred twelve million, three thousand, one hundred thirty-one".