51809633 has 8 divisors (see below), whose sum is σ = 52668168. Its totient is φ = 50955264.

The previous prime is 51809629. The next prime is 51809671. The reversal of 51809633 is 33690815.

It can be written as a sum of positive squares in 4 ways, for example, as 7879249 + 43930384 = 2807^2 + 6628^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 51809633 - 2² = 51809629 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51809593 and 51809602.

It is not an unprimeable number, because it can be changed into a prime (51809033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32585 + ... + 34137.

It is an arithmetic number, because the mean of its divisors is an integer number (6583521).

Almost surely, 2^51809633 is an apocalyptic number.

It is an amenable number.

51809633 is a deficient number, since it is larger than the sum of its proper divisors (858535).

51809633 is a wasteful number, since it uses less digits than its factorization.

51809633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2083.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 51809633 is about 7197.8908716373. The cubic root of 51809633 is about 372.7950799121.

The spelling of 51809633 in words is "fifty-one million, eight hundred nine thousand, six hundred thirty-three".