51431123 has 4 divisors (see below), whose sum is σ = 53204640. Its totient is φ = 49657608.

The previous prime is 51431099. The next prime is 51431131. The reversal of 51431123 is 32113415.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51431123 - 2¹⁸ = 51168979 is a prime.

It is a super-2 number, since 2×51431123² = 5290320826082258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51431095 and 51431104.

It is not an unprimeable number, because it can be changed into a prime (51431153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 886715 + ... + 886772.

It is an arithmetic number, because the mean of its divisors is an integer number (13301160).

Almost surely, 2^51431123 is an apocalyptic number.

51431123 is a deficient number, since it is larger than the sum of its proper divisors (1773517).

51431123 is a wasteful number, since it uses less digits than its factorization.

51431123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1773516.

The product of its digits is 360, while the sum is 20.

The square root of 51431123 is about 7171.5495536181. The cubic root of 51431123 is about 371.8850065617.

Adding to 51431123 its reverse (32113415), we get a palindrome (83544538).

The spelling of 51431123 in words is "fifty-one million, four hundred thirty-one thousand, one hundred twenty-three".