556531973 has 2 divisors, whose sum is σ = 556531974. Its totient is φ = 556531972.

The previous prime is 556531967. The next prime is 556531999. The reversal of 556531973 is 379135655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 299186209 + 257345764 = 17297^2 + 16042^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-556531973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556531903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278265986 + 278265987.

It is an arithmetic number, because the mean of its divisors is an integer number (278265987).

Almost surely, 2^556531973 is an apocalyptic number.

It is an amenable number.

556531973 is a deficient number, since it is larger than the sum of its proper divisors (1).

556531973 is an equidigital number, since it uses as much as digits as its factorization.

556531973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 425250, while the sum is 44.

The square root of 556531973 is about 23590.9298884126. The cubic root of 556531973 is about 822.5520200651.

The spelling of 556531973 in words is "five hundred fifty-six million, five hundred thirty-one thousand, nine hundred seventy-three".