55291889 has 4 divisors (see below), whose sum is σ = 56070720. Its totient is φ = 54513060.

The previous prime is 55291867. The next prime is 55291891. The reversal of 55291889 is 98819255.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55291889 - 2²⁰ = 54243313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55291829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389309 + ... + 389450.

It is an arithmetic number, because the mean of its divisors is an integer number (14017680).

Almost surely, 2^55291889 is an apocalyptic number.

It is an amenable number.

55291889 is a deficient number, since it is larger than the sum of its proper divisors (778831).

55291889 is an equidigital number, since it uses as much as digits as its factorization.

55291889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778830.

The product of its digits is 259200, while the sum is 47.

The square root of 55291889 is about 7435.8515988419. The cubic root of 55291889 is about 380.9668109685.

The spelling of 55291889 in words is "fifty-five million, two hundred ninety-one thousand, eight hundred eighty-nine".