55321591 has 8 divisors (see below), whose sum is σ = 59840480. Its totient is φ = 50840352.

The previous prime is 55321579. The next prime is 55321627. The reversal of 55321591 is 19512355.

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 55321591 - 2¹³ = 55313399 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 (55321501) 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, 6315 + ... + 12268.

It is an arithmetic number, because the mean of its divisors is an integer number (7480060).

Almost surely, 2^55321591 is an apocalyptic number.

55321591 is a deficient number, since it is larger than the sum of its proper divisors (4518889).

55321591 is a wasteful number, since it uses less digits than its factorization.

55321591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18825.

The product of its digits is 6750, while the sum is 31.

The square root of 55321591 is about 7437.8485464548. The cubic root of 55321591 is about 381.0350153704.

The spelling of 55321591 in words is "fifty-five million, three hundred twenty-one thousand, five hundred ninety-one".