55757581 has 8 divisors (see below), whose sum is σ = 62310528. Its totient is φ = 49452000.

The previous prime is 55757563. The next prime is 55757591. The reversal of 55757581 is 18575755.

It is a happy number.

55757581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55757581 - 2⁷ = 55757453 is a prime.

It is a super-2 number, since 2×55757581² = 6217815677943122, 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 (55757531) 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 7 ways as a sum of consecutive naturals, for example, 61365 + ... + 62266.

It is an arithmetic number, because the mean of its divisors is an integer number (7788816).

Almost surely, 2^55757581 is an apocalyptic number.

It is an amenable number.

55757581 is a deficient number, since it is larger than the sum of its proper divisors (6552947).

55757581 is a wasteful number, since it uses less digits than its factorization.

55757581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123683.

The product of its digits is 245000, while the sum is 43.

The square root of 55757581 is about 7467.0999055858. The cubic root of 55757581 is about 382.0333774733.

The spelling of 55757581 in words is "fifty-five million, seven hundred fifty-seven thousand, five hundred eighty-one".