55172205 has 64 divisors (see below), whose sum is σ = 109175040. Its totient is φ = 26208000.

The previous prime is 55172179. The next prime is 55172231. The reversal of 55172205 is 50227155.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (55172179) and next prime (55172231).

It is not a de Polignac number, because 55172205 - 2²⁵ = 21617773 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 78355 + ... + 79055.

It is an arithmetic number, because the mean of its divisors is an integer number (1705860).

Almost surely, 2^55172205 is an apocalyptic number.

55172205 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

55172205 is a deficient number, since it is larger than the sum of its proper divisors (54002835).

55172205 is a wasteful number, since it uses less digits than its factorization.

55172205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779 (or 773 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 55172205 is about 7427.7994722529. The cubic root of 55172205 is about 380.6917340342.

The spelling of 55172205 in words is "fifty-five million, one hundred seventy-two thousand, two hundred five".