55865261 has 4 divisors (see below), whose sum is σ = 55883772. Its totient is φ = 55846752.

The previous prime is 55865239. The next prime is 55865269. The reversal of 55865261 is 16256855.

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 16564900 + 39300361 = 4070^2 + 6269^2 .

It is a cyclic number.

It is not a de Polignac number, because 55865261 - 2⁶ = 55865197 is a prime.

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 (55865269) 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, 3560 + ... + 11153.

It is an arithmetic number, because the mean of its divisors is an integer number (13970943).

Almost surely, 2^55865261 is an apocalyptic number.

It is an amenable number.

55865261 is a deficient number, since it is larger than the sum of its proper divisors (18511).

55865261 is a wasteful number, since it uses less digits than its factorization.

55865261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18510.

The product of its digits is 72000, while the sum is 38.

The square root of 55865261 is about 7474.3067237035. The cubic root of 55865261 is about 382.2791491394.

The spelling of 55865261 in words is "fifty-five million, eight hundred sixty-five thousand, two hundred sixty-one".