1231301321 has 4 divisors (see below), whose sum is σ = 1233330432. Its totient is φ = 1229272212.

The previous prime is 1231301303. The next prime is 1231301329. The reversal of 1231301321 is 1231031321.

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 1231301321 - 2⁶ = 1231301257 is a prime.

It is a super-2 number, since 2×1231301321² = 3032205886192690082, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231301321.

It is not an unprimeable number, because it can be changed into a prime (1231301329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1013645 + ... + 1014858.

It is an arithmetic number, because the mean of its divisors is an integer number (308332608).

Almost surely, 2^1231301321 is an apocalyptic number.

It is an amenable number.

1231301321 is a deficient number, since it is larger than the sum of its proper divisors (2029111).

1231301321 is an equidigital number, since it uses as much as digits as its factorization.

1231301321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2029110.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1231301321 is about 35089.9034053957. The cubic root of 1231301321 is about 1071.8189926179.

Adding to 1231301321 its reverse (1231031321), we get a palindrome (2462332642).

The spelling of 1231301321 in words is "one billion, two hundred thirty-one million, three hundred one thousand, three hundred twenty-one".