1312242331 has 4 divisors (see below), whose sum is σ = 1312341472. Its totient is φ = 1312143192.

The previous prime is 1312242313. The next prime is 1312242341. The reversal of 1312242331 is 1332422131.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1332422131 = 23 ⋅57931397.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312242331 is a prime.

It is a super-2 number, since 2×1312242331² = 3443959870536627122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312242301) 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, 25971 + ... + 57436.

It is an arithmetic number, because the mean of its divisors is an integer number (328085368).

Almost surely, 2^1312242331 is an apocalyptic number.

1312242331 is a deficient number, since it is larger than the sum of its proper divisors (99141).

1312242331 is an equidigital number, since it uses as much as digits as its factorization.

1312242331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99140.

The product of its digits is 864, while the sum is 22.

The square root of 1312242331 is about 36224.8855208681. The cubic root of 1312242331 is about 1094.8081316277.

Adding to 1312242331 its reverse (1332422131), we get a palindrome (2644664462).

The spelling of 1312242331 in words is "one billion, three hundred twelve million, two hundred forty-two thousand, three hundred thirty-one".