51331123 has 4 divisors (see below), whose sum is σ = 51432480. Its totient is φ = 51229768.

The previous prime is 51331117. The next prime is 51331151. The reversal of 51331123 is 32113315.

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 51331123 - 2⁹ = 51330611 is a prime.

It is a super-2 number, since 2×51331123² = 5269768376882258, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51331123.

It is not an unprimeable number, because it can be changed into a prime (51331223) 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 3 ways as a sum of consecutive naturals, for example, 49915 + ... + 50932.

It is an arithmetic number, because the mean of its divisors is an integer number (12858120).

Almost surely, 2^51331123 is an apocalyptic number.

51331123 is a deficient number, since it is larger than the sum of its proper divisors (101357).

51331123 is a wasteful number, since it uses less digits than its factorization.

51331123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101356.

The product of its digits is 270, while the sum is 19.

The square root of 51331123 is about 7164.5741673878. The cubic root of 51331123 is about 371.6438255607.

Adding to 51331123 its reverse (32113315), we get a palindrome (83444438).

The spelling of 51331123 in words is "fifty-one million, three hundred thirty-one thousand, one hundred twenty-three".