55538561 has 8 divisors (see below), whose sum is σ = 59881920. Its totient is φ = 51205392.

The previous prime is 55538531. The next prime is 55538563. The reversal of 55538561 is 16583555.

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 55538561 - 2¹⁴ = 55522177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55538563) 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, 11810 + ... + 15828.

It is an arithmetic number, because the mean of its divisors is an integer number (7485240).

Almost surely, 2^55538561 is an apocalyptic number.

It is an amenable number.

55538561 is a deficient number, since it is larger than the sum of its proper divisors (4343359).

55538561 is a wasteful number, since it uses less digits than its factorization.

55538561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5095.

The product of its digits is 90000, while the sum is 38.

The square root of 55538561 is about 7452.4198083576. The cubic root of 55538561 is about 381.5325023969.

The spelling of 55538561 in words is "fifty-five million, five hundred thirty-eight thousand, five hundred sixty-one".