556340321 has 16 divisors (see below), whose sum is σ = 590673600. Its totient is φ = 523094208.

The previous prime is 556340303. The next prime is 556340339. The reversal of 556340321 is 123043655.

It is an interprime number because it is at equal distance from previous prime (556340303) and next prime (556340339).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-556340321 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (556340341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 821435 + ... + 822111.

It is an arithmetic number, because the mean of its divisors is an integer number (36917100).

Almost surely, 2^556340321 is an apocalyptic number.

It is an amenable number.

556340321 is a deficient number, since it is larger than the sum of its proper divisors (34333279).

556340321 is a wasteful number, since it uses less digits than its factorization.

556340321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 556340321 is about 23586.8675537893. The cubic root of 556340321 is about 822.4575889293.

Adding to 556340321 its reverse (123043655), we get a palindrome (679383976).

The spelling of 556340321 in words is "five hundred fifty-six million, three hundred forty thousand, three hundred twenty-one".