51988719 has 4 divisors (see below), whose sum is σ = 69318296. Its totient is φ = 34659144.

The previous prime is 51988681. The next prime is 51988723. The reversal of 51988719 is 91788915.

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

It is not a de Polignac number, because 51988719 - 2⁸ = 51988463 is a prime.

It is a super-2 number, since 2×51988719² = 5405653806521922, 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 (51988759) 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, 8664784 + ... + 8664789.

It is an arithmetic number, because the mean of its divisors is an integer number (17329574).

Almost surely, 2^51988719 is an apocalyptic number.

51988719 is a deficient number, since it is larger than the sum of its proper divisors (17329577).

51988719 is a wasteful number, since it uses less digits than its factorization.

51988719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17329576.

The product of its digits is 181440, while the sum is 48.

The square root of 51988719 is about 7210.3203118863. The cubic root of 51988719 is about 373.2241224102.

The spelling of 51988719 in words is "fifty-one million, nine hundred eighty-eight thousand, seven hundred nineteen".