1231340321 has 8 divisors (see below), whose sum is σ = 1250591400. Its totient is φ = 1212236032.

The previous prime is 1231340309. The next prime is 1231340323. The reversal of 1231340321 is 1230431321.

It can be written as a sum of positive squares in 4 ways, for example, as 102400 + 1231237921 = 320^2 + 35089^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231340321 is a prime.

It is a super-2 number, since 2×1231340321² = 3032397972240766082, 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 = 1231340293 and 1231340302.

It is not an unprimeable number, because it can be changed into a prime (1231340323) 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, 19730 + ... + 53403.

It is an arithmetic number, because the mean of its divisors is an integer number (156323925).

Almost surely, 2^1231340321 is an apocalyptic number.

It is an amenable number.

1231340321 is a deficient number, since it is larger than the sum of its proper divisors (19251079).

1231340321 is a wasteful number, since it uses less digits than its factorization.

1231340321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73395.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1231340321 is about 35090.4591164037. The cubic root of 1231340321 is about 1071.8303086943.

Adding to 1231340321 its reverse (1230431321), we get a palindrome (2461771642).

The spelling of 1231340321 in words is "one billion, two hundred thirty-one million, three hundred forty thousand, three hundred twenty-one".