556402109 has 4 divisors (see below), whose sum is σ = 566900316. Its totient is φ = 545903904.

The previous prime is 556402097. The next prime is 556402111. The reversal of 556402109 is 901204655.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 338928100 + 217474009 = 18410^2 + 14747^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-556402109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556402139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5249024 + ... + 5249129.

It is an arithmetic number, because the mean of its divisors is an integer number (141725079).

Almost surely, 2^556402109 is an apocalyptic number.

It is an amenable number.

556402109 is a deficient number, since it is larger than the sum of its proper divisors (10498207).

556402109 is a wasteful number, since it uses less digits than its factorization.

556402109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10498206.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 556402109 is about 23588.1773140699. The cubic root of 556402109 is about 822.4880355980.

The spelling of 556402109 in words is "five hundred fifty-six million, four hundred two thousand, one hundred nine".