55589999 has 4 divisors (see below), whose sum is σ = 55608336. Its totient is φ = 55571664.

The previous prime is 55589993. The next prime is 55590019. The reversal of 55589999 is 99998555.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55589999 is a prime.

It is a Duffinian number.

55589999 is a modest number, since divided by 9999 gives 5558 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55589993) 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, 3419 + ... + 11084.

It is an arithmetic number, because the mean of its divisors is an integer number (13902084).

Almost surely, 2^55589999 is an apocalyptic number.

55589999 is a deficient number, since it is larger than the sum of its proper divisors (18337).

55589999 is a wasteful number, since it uses less digits than its factorization.

55589999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18336.

The product of its digits is 6561000, while the sum is 59.

The square root of 55589999 is about 7455.8701034822. The cubic root of 55589999 is about 381.6502536965.

The spelling of 55589999 in words is "fifty-five million, five hundred eighty-nine thousand, nine hundred ninety-nine".