51123819 has 4 divisors (see below), whose sum is σ = 68165096. Its totient is φ = 34082544.

The previous prime is 51123817. The next prime is 51123833. The reversal of 51123819 is 91832115.

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

It is not a de Polignac number, because 51123819 - 2¹ = 51123817 is a prime.

It is a super-2 number, since 2×51123819² = 5227289738289522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51123817) 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, 8520634 + ... + 8520639.

It is an arithmetic number, because the mean of its divisors is an integer number (17041274).

Almost surely, 2^51123819 is an apocalyptic number.

51123819 is a deficient number, since it is larger than the sum of its proper divisors (17041277).

51123819 is a wasteful number, since it uses less digits than its factorization.

51123819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17041276.

The product of its digits is 2160, while the sum is 30.

The square root of 51123819 is about 7150.0922371673. The cubic root of 51123819 is about 371.1428481476.

The spelling of 51123819 in words is "fifty-one million, one hundred twenty-three thousand, eight hundred nineteen".