51942719 has 4 divisors (see below), whose sum is σ = 51957144. Its totient is φ = 51928296.

The previous prime is 51942707. The next prime is 51942743. The reversal of 51942719 is 91724915.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 91724915 = 5 ⋅18344983.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51942719 is a prime.

It is a super-2 number, since 2×51942719² = 5396092114225922, 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 (51942749) 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, 3209 + ... + 10685.

It is an arithmetic number, because the mean of its divisors is an integer number (12989286).

Almost surely, 2^51942719 is an apocalyptic number.

51942719 is a deficient number, since it is larger than the sum of its proper divisors (14425).

51942719 is an equidigital number, since it uses as much as digits as its factorization.

51942719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14424.

The product of its digits is 22680, while the sum is 38.

The square root of 51942719 is about 7207.1297338122. The cubic root of 51942719 is about 373.1140127813.

The spelling of 51942719 in words is "fifty-one million, nine hundred forty-two thousand, seven hundred nineteen".