556005591 has 12 divisors (see below), whose sum is σ = 803449920. Its totient is φ = 370517760.

The previous prime is 556005559. The next prime is 556005613. The reversal of 556005591 is 195500655.

556005591 is a `hidden beast` number, since 5 + 5 + 60 + 0 + 5 + 591 = 666.

It is not a de Polignac number, because 556005591 - 2⁵ = 556005559 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556005521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13111 + ... + 35831.

It is an arithmetic number, because the mean of its divisors is an integer number (66954160).

Almost surely, 2^556005591 is an apocalyptic number.

556005591 is a deficient number, since it is larger than the sum of its proper divisors (247444329).

556005591 is a wasteful number, since it uses less digits than its factorization.

556005591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25446 (or 25443 counting only the distinct ones).

The product of its (nonzero) digits is 33750, while the sum is 36.

The square root of 556005591 is about 23579.7708004128. The cubic root of 556005591 is about 822.2926081014.

The spelling of 556005591 in words is "five hundred fifty-six million, five thousand, five hundred ninety-one".