55859917 has 4 divisors (see below), whose sum is σ = 57222396. Its totient is φ = 54497440.

The previous prime is 55859849. The next prime is 55859927. The reversal of 55859917 is 71995855.

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 24790441 + 31069476 = 4979^2 + 5574^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55859917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55859927) 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, 681178 + ... + 681259.

It is an arithmetic number, because the mean of its divisors is an integer number (14305599).

Almost surely, 2^55859917 is an apocalyptic number.

It is an amenable number.

55859917 is a deficient number, since it is larger than the sum of its proper divisors (1362479).

55859917 is a wasteful number, since it uses less digits than its factorization.

55859917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1362478.

The product of its digits is 567000, while the sum is 49.

The square root of 55859917 is about 7473.9492238040. The cubic root of 55859917 is about 382.2669593046.

The spelling of 55859917 in words is "fifty-five million, eight hundred fifty-nine thousand, nine hundred seventeen".