51809500933 has 4 divisors (see below), whose sum is σ = 51810517888. Its totient is φ = 51808483980.

The previous prime is 51809500921. The next prime is 51809500957. The reversal of 51809500933 is 33900590815.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51809500933 - 2²⁹ = 51272630021 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 51809500933.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51809500433) 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, 427791 + ... + 535372.

It is an arithmetic number, because the mean of its divisors is an integer number (12952629472).

Almost surely, 2^51809500933 is an apocalyptic number.

It is an amenable number.

51809500933 is a deficient number, since it is larger than the sum of its proper divisors (1016955).

51809500933 is an equidigital number, since it uses as much as digits as its factorization.

51809500933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016954.

The product of its (nonzero) digits is 145800, while the sum is 43.

The spelling of 51809500933 in words is "fifty-one billion, eight hundred nine million, five hundred thousand, nine hundred thirty-three".