556402181 has 2 divisors, whose sum is σ = 556402182. Its totient is φ = 556402180.

The previous prime is 556402157. The next prime is 556402201. The reversal of 556402181 is 181204655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 386751556 + 169650625 = 19666^2 + 13025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-556402181 is a prime.

It is a super-2 number, since 2×556402181² = 619166774043113522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556402111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278201090 + 278201091.

It is an arithmetic number, because the mean of its divisors is an integer number (278201091).

Almost surely, 2^556402181 is an apocalyptic number.

It is an amenable number.

556402181 is a deficient number, since it is larger than the sum of its proper divisors (1).

556402181 is an equidigital number, since it uses as much as digits as its factorization.

556402181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 556402181 is about 23588.1788402581. The cubic root of 556402181 is about 822.4880710754.

The spelling of 556402181 in words is "five hundred fifty-six million, four hundred two thousand, one hundred eighty-one".