556402123 has 2 divisors, whose sum is σ = 556402124. Its totient is φ = 556402122.

The previous prime is 556402111. The next prime is 556402139. The reversal of 556402123 is 321204655.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-556402123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 556402091 and 556402100.

It is not a weakly prime, because it can be changed into another prime (556402153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278201061 + 278201062.

It is an arithmetic number, because the mean of its divisors is an integer number (278201062).

Almost surely, 2^556402123 is an apocalyptic number.

556402123 is a deficient number, since it is larger than the sum of its proper divisors (1).

556402123 is an equidigital number, since it uses as much as digits as its factorization.

556402123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 556402123 is about 23588.1776108287. The cubic root of 556402123 is about 822.4880424964.

Adding to 556402123 its reverse (321204655), we get a palindrome (877606778).

The spelling of 556402123 in words is "five hundred fifty-six million, four hundred two thousand, one hundred twenty-three".