55417861 has 4 divisors (see below), whose sum is σ = 55442092. Its totient is φ = 55393632.

The previous prime is 55417849. The next prime is 55417867. The reversal of 55417861 is 16871455.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16871455 = 5 ⋅3374291.

It can be written as a sum of positive squares in 2 ways, for example, as 43480836 + 11937025 = 6594^2 + 3455^2 .

It is a cyclic number.

It is not a de Polignac number, because 55417861 - 2¹⁵ = 55385093 is a prime.

It is a super-2 number, since 2×55417861² = 6142278635630642, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55417861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55417867) 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, 8280 + ... + 13393.

It is an arithmetic number, because the mean of its divisors is an integer number (13860523).

Almost surely, 2^55417861 is an apocalyptic number.

It is an amenable number.

55417861 is a deficient number, since it is larger than the sum of its proper divisors (24231).

55417861 is a wasteful number, since it uses less digits than its factorization.

55417861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24230.

The product of its digits is 33600, while the sum is 37.

The square root of 55417861 is about 7444.3173629286. The cubic root of 55417861 is about 381.2559115450.

The spelling of 55417861 in words is "fifty-five million, four hundred seventeen thousand, eight hundred sixty-one".