55540591 has 8 divisors (see below), whose sum is σ = 58538480. Its totient is φ = 52550208.

The previous prime is 55540579. The next prime is 55540601. The reversal of 55540591 is 19504555.

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 55540591 - 2⁵ = 55540559 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 (55540571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19915 + ... + 22531.

It is an arithmetic number, because the mean of its divisors is an integer number (7317310).

Almost surely, 2^55540591 is an apocalyptic number.

55540591 is a deficient number, since it is larger than the sum of its proper divisors (2997889).

55540591 is a wasteful number, since it uses less digits than its factorization.

55540591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3753.

The product of its (nonzero) digits is 22500, while the sum is 34.

The square root of 55540591 is about 7452.5560044860. The cubic root of 55540591 is about 381.5371508281.

The spelling of 55540591 in words is "fifty-five million, five hundred forty thousand, five hundred ninety-one".