55391599 has 8 divisors (see below), whose sum is σ = 56451248. Its totient is φ = 54336960.

The previous prime is 55391591. The next prime is 55391603. The reversal of 55391599 is 99519355.

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 55391599 - 2³ = 55391591 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 (55391591) 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, 26884 + ... + 28870.

It is an arithmetic number, because the mean of its divisors is an integer number (7056406).

Almost surely, 2^55391599 is an apocalyptic number.

55391599 is a deficient number, since it is larger than the sum of its proper divisors (1059649).

55391599 is a wasteful number, since it uses less digits than its factorization.

55391599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2505.

The product of its digits is 273375, while the sum is 46.

The square root of 55391599 is about 7442.5532581232. The cubic root of 55391599 is about 381.1956775061.

The spelling of 55391599 in words is "fifty-five million, three hundred ninety-one thousand, five hundred ninety-nine".