51128519 has 4 divisors (see below), whose sum is σ = 55061496. Its totient is φ = 47195544.

The previous prime is 51128513. The next prime is 51128531. The reversal of 51128519 is 91582115.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51128519 is a prime.

It is a super-2 number, since 2×51128519² = 5228250910266722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51128513) 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, 1966469 + ... + 1966494.

It is an arithmetic number, because the mean of its divisors is an integer number (13765374).

Almost surely, 2^51128519 is an apocalyptic number.

51128519 is a deficient number, since it is larger than the sum of its proper divisors (3932977).

51128519 is a wasteful number, since it uses less digits than its factorization.

51128519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3932976.

The product of its digits is 3600, while the sum is 32.

The square root of 51128519 is about 7150.4208967025. The cubic root of 51128519 is about 371.1542213064.

It can be divided in two parts, 5112 and 8519, that added together give a palindrome (13631).

The spelling of 51128519 in words is "fifty-one million, one hundred twenty-eight thousand, five hundred nineteen".