1231000321 has 4 divisors (see below), whose sum is σ = 1231110144. Its totient is φ = 1230890500.

The previous prime is 1231000289. The next prime is 1231000349. The reversal of 1231000321 is 1230001321.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1231000321 - 2⁵ = 1231000289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231006321) 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, 35905 + ... + 61246.

It is an arithmetic number, because the mean of its divisors is an integer number (307777536).

Almost surely, 2^1231000321 is an apocalyptic number.

It is an amenable number.

1231000321 is a deficient number, since it is larger than the sum of its proper divisors (109823).

1231000321 is an equidigital number, since it uses as much as digits as its factorization.

1231000321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109822.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1231000321 is about 35085.6141602224. The cubic root of 1231000321 is about 1071.7316476809.

Adding to 1231000321 its reverse (1230001321), we get a palindrome (2461001642).

It can be divided in two parts, 1231000 and 321, that added together give a palindrome (1231321).

The spelling of 1231000321 in words is "one billion, two hundred thirty-one million, three hundred twenty-one", and thus it is an aban number.