1312220131 has 4 divisors (see below), whose sum is σ = 1316698992. Its totient is φ = 1307741272.

The previous prime is 1312220093. The next prime is 1312220141. The reversal of 1312220131 is 1310222131.

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 1312220131 - 2¹⁷ = 1312089059 is a prime.

It is a super-2 number, since 2×1312220131² = 3443843344403314322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312220141) 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, 2238991 + ... + 2239576.

It is an arithmetic number, because the mean of its divisors is an integer number (329174748).

Almost surely, 2^1312220131 is an apocalyptic number.

1312220131 is a deficient number, since it is larger than the sum of its proper divisors (4478861).

1312220131 is an equidigital number, since it uses as much as digits as its factorization.

1312220131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4478860.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1312220131 is about 36224.5791003843. The cubic root of 1312220131 is about 1094.8019577484.

Adding to 1312220131 its reverse (1310222131), we get a palindrome (2622442262).

The spelling of 1312220131 in words is "one billion, three hundred twelve million, two hundred twenty thousand, one hundred thirty-one".