556109987 has 4 divisors (see below), whose sum is σ = 565535640. Its totient is φ = 546684336.

The previous prime is 556109971. The next prime is 556110029. The reversal of 556109987 is 789901655.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 556109987 - 2⁴ = 556109971 is a prime.

It is a super-2 number, since 2×556109987² = 618516635282280338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (556103987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4712738 + ... + 4712855.

It is an arithmetic number, because the mean of its divisors is an integer number (141383910).

Almost surely, 2^556109987 is an apocalyptic number.

556109987 is a deficient number, since it is larger than the sum of its proper divisors (9425653).

556109987 is an equidigital number, since it uses as much as digits as its factorization.

556109987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9425652.

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

The square root of 556109987 is about 23581.9843736697. The cubic root of 556109987 is about 822.3440696265.

The spelling of 556109987 in words is "five hundred fifty-six million, one hundred nine thousand, nine hundred eighty-seven".