55578181 has 8 divisors (see below), whose sum is σ = 59049720. Its totient is φ = 52210368.

The previous prime is 55578169. The next prime is 55578203. The reversal of 55578181 is 18187555.

It can be written as a sum of positive squares in 4 ways, for example, as 11621281 + 43956900 = 3409^2 + 6630^2 .

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 55578181 - 2⁷ = 55578053 is a prime.

It is a super-2 number, since 2×55578181² = 6177868406537522, 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 (55570181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24826 + ... + 26971.

It is an arithmetic number, because the mean of its divisors is an integer number (7381215).

Almost surely, 2^55578181 is an apocalyptic number.

It is an amenable number.

55578181 is a deficient number, since it is larger than the sum of its proper divisors (3471539).

55578181 is a wasteful number, since it uses less digits than its factorization.

55578181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51863.

The product of its digits is 56000, while the sum is 40.

The square root of 55578181 is about 7455.0775314547. The cubic root of 55578181 is about 381.6232064911.

The spelling of 55578181 in words is "fifty-five million, five hundred seventy-eight thousand, one hundred eighty-one".