556043409 has 24 divisors (see below), whose sum is σ = 816718760. Its totient is φ = 364476672.

The previous prime is 556043399. The next prime is 556043413. The reversal of 556043409 is 904340655.

It is a happy number.

556043409 is a `hidden beast` number, since 5 + 5 + 604 + 3 + 40 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 14085009 + 541958400 = 3753^2 + 23280^2 .

It is not a de Polignac number, because 556043409 - 2¹¹ = 556041361 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (556043459) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 243927 + ... + 246195.

Almost surely, 2^556043409 is an apocalyptic number.

It is an amenable number.

556043409 is a deficient number, since it is larger than the sum of its proper divisors (260675351).

556043409 is a wasteful number, since it uses less digits than its factorization.

556043409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2721 (or 2718 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 556043409 is about 23580.5727029689. The cubic root of 556043409 is about 822.3112510536.

The spelling of 556043409 in words is "five hundred fifty-six million, forty-three thousand, four hundred nine".