51995969 has 4 divisors (see below), whose sum is σ = 52044720. Its totient is φ = 51947220.

The previous prime is 51995963. The next prime is 51995981. The reversal of 51995969 is 96959915.

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 51995969 - 2¹² = 51991873 is a prime.

It is a super-2 number, since 2×51995969² = 5407161584497922, which contains 22 as substring.

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 51995969.

It is not an unprimeable number, because it can be changed into a prime (51995963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22739 + ... + 24920.

It is an arithmetic number, because the mean of its divisors is an integer number (13011180).

Almost surely, 2^51995969 is an apocalyptic number.

It is an amenable number.

51995969 is a deficient number, since it is larger than the sum of its proper divisors (48751).

51995969 is a wasteful number, since it uses less digits than its factorization.

51995969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48750.

The product of its digits is 984150, while the sum is 53.

The square root of 51995969 is about 7210.8230459497. The cubic root of 51995969 is about 373.2414707194.

The spelling of 51995969 in words is "fifty-one million, nine hundred ninety-five thousand, nine hundred sixty-nine".