55368581 has 4 divisors (see below), whose sum is σ = 55384812. Its totient is φ = 55352352.

The previous prime is 55368559. The next prime is 55368583. The reversal of 55368581 is 18586355.

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 15249025 + 40119556 = 3905^2 + 6334^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55368581 is a prime.

It is a super-2 number, since 2×55368581² = 6131359523907122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55368583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 800 + ... + 10553.

It is an arithmetic number, because the mean of its divisors is an integer number (13846203).

Almost surely, 2^55368581 is an apocalyptic number.

It is an amenable number.

55368581 is a deficient number, since it is larger than the sum of its proper divisors (16231).

55368581 is a wasteful number, since it uses less digits than its factorization.

55368581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16230.

The product of its digits is 144000, while the sum is 41.

The square root of 55368581 is about 7441.0067195239. The cubic root of 55368581 is about 381.1428681876.

The spelling of 55368581 in words is "fifty-five million, three hundred sixty-eight thousand, five hundred eighty-one".