51759921 has 8 divisors (see below), whose sum is σ = 69062560. Its totient is φ = 34481952.

The previous prime is 51759907. The next prime is 51759947. The reversal of 51759921 is 12995715.

51759921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 51759921 - 2⁷ = 51759793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51759921.

It is not an unprimeable number, because it can be changed into a prime (51759901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 535 + ... + 10188.

It is an arithmetic number, because the mean of its divisors is an integer number (8632820).

Almost surely, 2^51759921 is an apocalyptic number.

It is an amenable number.

51759921 is a deficient number, since it is larger than the sum of its proper divisors (17302639).

51759921 is a wasteful number, since it uses less digits than its factorization.

51759921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12335.

The product of its digits is 28350, while the sum is 39.

The square root of 51759921 is about 7194.4368090908. The cubic root of 51759921 is about 372.6758078871.

The spelling of 51759921 in words is "fifty-one million, seven hundred fifty-nine thousand, nine hundred twenty-one".