51689445 has 8 divisors (see below), whose sum is σ = 82703136. Its totient is φ = 27567696.

The previous prime is 51689423. The next prime is 51689461. The reversal of 51689445 is 54498615.

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

It is not a de Polignac number, because 51689445 - 2⁵ = 51689413 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 51689397 and 51689406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1722967 + ... + 1722996.

It is an arithmetic number, because the mean of its divisors is an integer number (10337892).

Almost surely, 2^51689445 is an apocalyptic number.

It is an amenable number.

51689445 is a deficient number, since it is larger than the sum of its proper divisors (31013691).

51689445 is a wasteful number, since it uses less digits than its factorization.

51689445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3445971.

The product of its digits is 172800, while the sum is 42.

The square root of 51689445 is about 7189.5371895554. The cubic root of 51689445 is about 372.5065866739.

The spelling of 51689445 in words is "fifty-one million, six hundred eighty-nine thousand, four hundred forty-five".