55089581 has 4 divisors (see below), whose sum is σ = 55595100. Its totient is φ = 54584064.

The previous prime is 55089563. The next prime is 55089583. The reversal of 55089581 is 18598055.

55089581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 42902500 + 12187081 = 6550^2 + 3491^2 .

It is a cyclic number.

It is not a de Polignac number, because 55089581 - 2¹⁰ = 55088557 is a prime.

It is a super-2 number, since 2×55089581² = 6069723869511122, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55089583) 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, 252596 + ... + 252813.

It is an arithmetic number, because the mean of its divisors is an integer number (13898775).

Almost surely, 2^55089581 is an apocalyptic number.

It is an amenable number.

55089581 is a deficient number, since it is larger than the sum of its proper divisors (505519).

55089581 is a wasteful number, since it uses less digits than its factorization.

55089581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505518.

The product of its (nonzero) digits is 72000, while the sum is 41.

The square root of 55089581 is about 7422.2355796620. The cubic root of 55089581 is about 380.5016021340.

The spelling of 55089581 in words is "fifty-five million, eighty-nine thousand, five hundred eighty-one".