51222173 has 16 divisors (see below), whose sum is σ = 56920320. Its totient is φ = 45847296.

The previous prime is 51222163. The next prime is 51222187. The reversal of 51222173 is 37122215.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51222173 - 2¹⁴ = 51205789 is a prime.

It is a super-2 number, since 2×51222173² = 5247422013683858, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51222113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104936 + ... + 105422.

It is an arithmetic number, because the mean of its divisors is an integer number (3557520).

Almost surely, 2^51222173 is an apocalyptic number.

It is an amenable number.

51222173 is a deficient number, since it is larger than the sum of its proper divisors (5698147).

51222173 is a wasteful number, since it uses less digits than its factorization.

51222173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796.

The product of its digits is 840, while the sum is 23.

The square root of 51222173 is about 7156.9667457660. The cubic root of 51222173 is about 371.3807020515.

Adding to 51222173 its reverse (37122215), we get a palindrome (88344388).

The spelling of 51222173 in words is "fifty-one million, two hundred twenty-two thousand, one hundred seventy-three".