1312331121 has 12 divisors (see below), whose sum is σ = 1995357520. Its totient is φ = 828840600.

The previous prime is 1312331101. The next prime is 1312331123. The reversal of 1312331121 is 1211332131.

1312331121 is a `hidden beast` number, since 1 + 312 + 331 + 1 + 21 = 666.

It is not a de Polignac number, because 1312331121 - 2⁹ = 1312330609 is a prime.

It is a super-2 number, since 2×1312331121² = 3444425942290233282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1312331094 and 1312331103.

It is not an unprimeable number, because it can be changed into a prime (1312331123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3837055 + ... + 3837396.

Almost surely, 2^1312331121 is an apocalyptic number.

It is an amenable number.

1312331121 is a deficient number, since it is larger than the sum of its proper divisors (683026399).

1312331121 is a wasteful number, since it uses less digits than its factorization.

1312331121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7674476 (or 7674473 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 1312331121 is about 36226.1110388626. Note that the first 3 decimals coincide. The cubic root of 1312331121 is about 1094.8328236680.

Adding to 1312331121 its reverse (1211332131), we get a palindrome (2523663252).

It can be divided in two parts, 13123 and 31121, that added together give a palindrome (44244).

The spelling of 1312331121 in words is "one billion, three hundred twelve million, three hundred thirty-one thousand, one hundred twenty-one".