51185223 has 8 divisors (see below), whose sum is σ = 75830000. Its totient is φ = 34123464.

The previous prime is 51185177. The next prime is 51185231. The reversal of 51185223 is 32258115.

It is a happy number.

It is not a de Polignac number, because 51185223 - 2⁶ = 51185159 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1895749 = 51185223 / (5 + 1 + 1 + 8 + 5 + 2 + 2 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51185263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 947848 + ... + 947901.

It is an arithmetic number, because the mean of its divisors is an integer number (9478750).

Almost surely, 2^51185223 is an apocalyptic number.

51185223 is a deficient number, since it is larger than the sum of its proper divisors (24644777).

51185223 is a wasteful number, since it uses less digits than its factorization.

51185223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1895758 (or 1895752 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

The square root of 51185223 is about 7154.3848792192. The cubic root of 51185223 is about 371.2913799402.

The spelling of 51185223 in words is "fifty-one million, one hundred eighty-five thousand, two hundred twenty-three".