51228519 has 4 divisors (see below), whose sum is σ = 68304696. Its totient is φ = 34152344.

The previous prime is 51228517. The next prime is 51228533. The reversal of 51228519 is 91582215.

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 51228519 - 2¹ = 51228517 is a prime.

It is a super-2 number, since 2×51228519² = 5248722317866722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51228519.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51228511) 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, 8538084 + ... + 8538089.

It is an arithmetic number, because the mean of its divisors is an integer number (17076174).

Almost surely, 2^51228519 is an apocalyptic number.

51228519 is a deficient number, since it is larger than the sum of its proper divisors (17076177).

51228519 is a wasteful number, since it uses less digits than its factorization.

51228519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17076176.

The product of its digits is 7200, while the sum is 33.

The square root of 51228519 is about 7157.4100762776. The cubic root of 51228519 is about 371.3960384087.

The spelling of 51228519 in words is "fifty-one million, two hundred twenty-eight thousand, five hundred nineteen".