55259989 has 4 divisors (see below), whose sum is σ = 55925856. Its totient is φ = 54594124.

The previous prime is 55259977. The next prime is 55260017. The reversal of 55259989 is 98995255.

It is a happy number.

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 55259989 - 2⁵ = 55259957 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 (55259089) 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, 332809 + ... + 332974.

It is an arithmetic number, because the mean of its divisors is an integer number (13981464).

Almost surely, 2^55259989 is an apocalyptic number.

It is an amenable number.

55259989 is a deficient number, since it is larger than the sum of its proper divisors (665867).

55259989 is an equidigital number, since it uses as much as digits as its factorization.

55259989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665866.

The product of its digits is 1458000, while the sum is 52.

The square root of 55259989 is about 7433.7062761452. The cubic root of 55259989 is about 380.8935321122.

The spelling of 55259989 in words is "fifty-five million, two hundred fifty-nine thousand, nine hundred eighty-nine".