1321231313 has 8 divisors (see below), whose sum is σ = 1416660480. Its totient is φ = 1227769920.

The previous prime is 1321231283. The next prime is 1321231321. The reversal of 1321231313 is 3131321231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1321231313 - 2¹² = 1321227217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321233313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 490553 + ... + 493238.

It is an arithmetic number, because the mean of its divisors is an integer number (177082560).

Almost surely, 2^1321231313 is an apocalyptic number.

It is an amenable number.

1321231313 is a deficient number, since it is larger than the sum of its proper divisors (95429167).

1321231313 is an equidigital number, since it uses as much as digits as its factorization.

1321231313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983887.

The product of its digits is 324, while the sum is 20.

The square root of 1321231313 is about 36348.7456867496. The cubic root of 1321231313 is about 1097.3022910308.

Adding to 1321231313 its reverse (3131321231), we get a palindrome (4452552544).

The spelling of 1321231313 in words is "one billion, three hundred twenty-one million, two hundred thirty-one thousand, three hundred thirteen".