556810997 has 2 divisors, whose sum is σ = 556810998. Its totient is φ = 556810996.

The previous prime is 556810993. The next prime is 556811011. The reversal of 556810997 is 799018655.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 553849156 + 2961841 = 23534^2 + 1721^2 .

It is a cyclic number.

It is not a de Polignac number, because 556810997 - 2² = 556810993 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556810993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278405498 + 278405499.

It is an arithmetic number, because the mean of its divisors is an integer number (278405499).

Almost surely, 2^556810997 is an apocalyptic number.

It is an amenable number.

556810997 is a deficient number, since it is larger than the sum of its proper divisors (1).

556810997 is an equidigital number, since it uses as much as digits as its factorization.

556810997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 680400, while the sum is 50.

The square root of 556810997 is about 23596.8429456146. The cubic root of 556810997 is about 822.6894625485.

The spelling of 556810997 in words is "five hundred fifty-six million, eight hundred ten thousand, nine hundred ninety-seven".