556745081 has 2 divisors, whose sum is σ = 556745082. Its totient is φ = 556745080.

The previous prime is 556745069. The next prime is 556745083. The reversal of 556745081 is 180547655.

556745081 = 16684² + 16685².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 278389225 + 278355856 = 16685^2 + 16684^2 .

It is a cyclic number.

It is not a de Polignac number, because 556745081 - 2²² = 552550777 is a prime.

It is a super-2 number, since 2×556745081² = 619930170435393122, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 556745083, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (556745083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278372540 + 278372541.

It is an arithmetic number, because the mean of its divisors is an integer number (278372541).

Almost surely, 2^556745081 is an apocalyptic number.

556745081 is the 16685-th centered square number.

It is an amenable number.

556745081 is a deficient number, since it is larger than the sum of its proper divisors (1).

556745081 is an equidigital number, since it uses as much as digits as its factorization.

556745081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168000, while the sum is 41.

The square root of 556745081 is about 23595.4461920092. The cubic root of 556745081 is about 822.6569975895.

The spelling of 556745081 in words is "five hundred fifty-six million, seven hundred forty-five thousand, eighty-one".