55561789 has 4 divisors (see below), whose sum is σ = 56472700. Its totient is φ = 54650880.

The previous prime is 55561787. The next prime is 55561837. The reversal of 55561789 is 98716555.

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 9253764 + 46308025 = 3042^2 + 6805^2 .

It is a cyclic number.

It is not a de Polignac number, because 55561789 - 2¹ = 55561787 is a prime.

It is a super-2 number, since 2×55561789² = 6174224793761042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55561787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455364 + ... + 455485.

It is an arithmetic number, because the mean of its divisors is an integer number (14118175).

Almost surely, 2^55561789 is an apocalyptic number.

It is an amenable number.

55561789 is a deficient number, since it is larger than the sum of its proper divisors (910911).

55561789 is an equidigital number, since it uses as much as digits as its factorization.

55561789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910910.

The product of its digits is 378000, while the sum is 46.

The square root of 55561789 is about 7453.9780654359. The cubic root of 55561789 is about 381.5856846760.

The spelling of 55561789 in words is "fifty-five million, five hundred sixty-one thousand, seven hundred eighty-nine".