51172123 has 4 divisors (see below), whose sum is σ = 51376248. Its totient is φ = 50968000.

The previous prime is 51172097. The next prime is 51172133. The reversal of 51172123 is 32127115.

It is a happy number.

51172123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32127115 = 5 ⋅6425423.

It is a cyclic number.

It is not a de Polignac number, because 51172123 - 2¹⁷ = 51041051 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51172094 and 51172103.

It is not an unprimeable number, because it can be changed into a prime (51172133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101686 + ... + 102187.

It is an arithmetic number, because the mean of its divisors is an integer number (12844062).

Almost surely, 2^51172123 is an apocalyptic number.

51172123 is a deficient number, since it is larger than the sum of its proper divisors (204125).

51172123 is a wasteful number, since it uses less digits than its factorization.

51172123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204124.

The product of its digits is 420, while the sum is 22.

The square root of 51172123 is about 7153.4692981797. The cubic root of 51172123 is about 371.2597019688.

Adding to 51172123 its reverse (32127115), we get a palindrome (83299238).

The spelling of 51172123 in words is "fifty-one million, one hundred seventy-two thousand, one hundred twenty-three".