51138223 has 16 divisors (see below), whose sum is σ = 56517120. Its totient is φ = 46103904.

The previous prime is 51138221. The next prime is 51138229. The reversal of 51138223 is 32283115.

It is a cyclic number.

It is not a de Polignac number, because 51138223 - 2¹ = 51138221 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 (51138221) 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, 27790 + ... + 29572.

It is an arithmetic number, because the mean of its divisors is an integer number (3532320).

Almost surely, 2^51138223 is an apocalyptic number.

51138223 is a deficient number, since it is larger than the sum of its proper divisors (5378897).

51138223 is a wasteful number, since it uses less digits than its factorization.

51138223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1878.

The product of its digits is 1440, while the sum is 25.

The square root of 51138223 is about 7151.0994259624. The cubic root of 51138223 is about 371.1777010446.

The spelling of 51138223 in words is "fifty-one million, one hundred thirty-eight thousand, two hundred twenty-three".