51689753 has 4 divisors (see below), whose sum is σ = 52537188. Its totient is φ = 50842320.

The previous prime is 51689749. The next prime is 51689761. The reversal of 51689753 is 35798615.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12652249 + 39037504 = 3557^2 + 6248^2 .

It is a cyclic number.

It is not a de Polignac number, because 51689753 - 2² = 51689749 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51689773) 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, 423626 + ... + 423747.

It is an arithmetic number, because the mean of its divisors is an integer number (13134297).

Almost surely, 2^51689753 is an apocalyptic number.

It is an amenable number.

51689753 is a deficient number, since it is larger than the sum of its proper divisors (847435).

51689753 is an equidigital number, since it uses as much as digits as its factorization.

51689753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847434.

The product of its digits is 226800, while the sum is 44.

The square root of 51689753 is about 7189.5586095393. The cubic root of 51689753 is about 372.5073265529.

The spelling of 51689753 in words is "fifty-one million, six hundred eighty-nine thousand, seven hundred fifty-three".