51500019 has 8 divisors (see below), whose sum is σ = 69691840. Its totient is φ = 33820776.

The previous prime is 51500011. The next prime is 51500023. The reversal of 51500019 is 91000515.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51500019 - 2³ = 51500011 is a prime.

It is a super-2 number, since 2×51500019² = 5304503914000722, 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 = 51499968 and 51500004.

It is not an unprimeable number, because it can be changed into a prime (51500011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127909 + ... + 128310.

It is an arithmetic number, because the mean of its divisors is an integer number (8711480).

Almost surely, 2^51500019 is an apocalyptic number.

51500019 is a deficient number, since it is larger than the sum of its proper divisors (18191821).

51500019 is a wasteful number, since it uses less digits than its factorization.

51500019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256289.

The product of its (nonzero) digits is 225, while the sum is 21.

The square root of 51500019 is about 7176.3513709963. The cubic root of 51500019 is about 372.0509887907.

The spelling of 51500019 in words is "fifty-one million, five hundred thousand, nineteen".