55438581 has 24 divisors (see below), whose sum is σ = 85675104. Its totient is φ = 31617280.

The previous prime is 55438577. The next prime is 55438589. The reversal of 55438581 is 18583455.

It is not a de Polignac number, because 55438581 - 2² = 55438577 is a prime.

It is a super-2 number, since 2×55438581² = 6146872526587122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55438589) 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 23 ways as a sum of consecutive naturals, for example, 6631 + ... + 12443.

It is an arithmetic number, because the mean of its divisors is an integer number (3569796).

Almost surely, 2^55438581 is an apocalyptic number.

55438581 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

55438581 is a deficient number, since it is larger than the sum of its proper divisors (30236523).

55438581 is a wasteful number, since it uses less digits than its factorization.

55438581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5861 (or 5844 counting only the distinct ones).

The product of its digits is 96000, while the sum is 39.

The square root of 55438581 is about 7445.7088984193. The cubic root of 55438581 is about 381.3034211266.

The spelling of 55438581 in words is "fifty-five million, four hundred thirty-eight thousand, five hundred eighty-one".