55445491 has 4 divisors (see below), whose sum is σ = 56017192. Its totient is φ = 54873792.

The previous prime is 55445461. The next prime is 55445497. The reversal of 55445491 is 19454455.

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

It is a cyclic number.

It is not a de Polignac number, because 55445491 - 2¹⁵ = 55412723 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55445491.

It is not an unprimeable number, because it can be changed into a prime (55445497) 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, 285705 + ... + 285898.

It is an arithmetic number, because the mean of its divisors is an integer number (14004298).

Almost surely, 2^55445491 is an apocalyptic number.

55445491 is a deficient number, since it is larger than the sum of its proper divisors (571701).

55445491 is an equidigital number, since it uses as much as digits as its factorization.

55445491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571700.

The product of its digits is 72000, while the sum is 37.

The square root of 55445491 is about 7446.1729096228. The cubic root of 55445491 is about 381.3192626647.

The spelling of 55445491 in words is "fifty-five million, four hundred forty-five thousand, four hundred ninety-one".