1321431113 has 4 divisors (see below), whose sum is σ = 1323847440. Its totient is φ = 1319014788.

The previous prime is 1321431101. The next prime is 1321431127. The reversal of 1321431113 is 3111341231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1321431113 - 2⁸ = 1321430857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1321431193) 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, 1207343 + ... + 1208436.

It is an arithmetic number, because the mean of its divisors is an integer number (330961860).

Almost surely, 2^1321431113 is an apocalyptic number.

It is an amenable number.

1321431113 is a deficient number, since it is larger than the sum of its proper divisors (2416327).

1321431113 is an equidigital number, since it uses as much as digits as its factorization.

1321431113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2416326.

The product of its digits is 216, while the sum is 20.

The square root of 1321431113 is about 36351.4939582956. The cubic root of 1321431113 is about 1097.3576005352.

Adding to 1321431113 its reverse (3111341231), we get a palindrome (4432772344).

The spelling of 1321431113 in words is "one billion, three hundred twenty-one million, four hundred thirty-one thousand, one hundred thirteen".