55337581 has 4 divisors (see below), whose sum is σ = 59594332. Its totient is φ = 51080832.

The previous prime is 55337561. The next prime is 55337587. The reversal of 55337581 is 18573355.

55337581 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 15760900 + 39576681 = 3970^2 + 6291^2 .

It is a cyclic number.

It is not a de Polignac number, because 55337581 - 2⁹ = 55337069 is a prime.

It is a super-2 number, since 2×55337581² = 6124495741863122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55337581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55337587) 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, 2128356 + ... + 2128381.

It is an arithmetic number, because the mean of its divisors is an integer number (14898583).

Almost surely, 2^55337581 is an apocalyptic number.

It is an amenable number.

55337581 is a deficient number, since it is larger than the sum of its proper divisors (4256751).

55337581 is a wasteful number, since it uses less digits than its factorization.

55337581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4256750.

The product of its digits is 63000, while the sum is 37.

The square root of 55337581 is about 7438.9233764033. The cubic root of 55337581 is about 381.0717229371.

The spelling of 55337581 in words is "fifty-five million, three hundred thirty-seven thousand, five hundred eighty-one".