51995885 has 4 divisors (see below), whose sum is σ = 62395068. Its totient is φ = 41596704.

The previous prime is 51995863. The next prime is 51995891. The reversal of 51995885 is 58859915.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58859915 = 5 ⋅11771983.

It can be written as a sum of positive squares in 2 ways, for example, as 39513796 + 12482089 = 6286^2 + 3533^2 .

It is a cyclic number.

It is not a de Polignac number, because 51995885 - 2²⁴ = 35218669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5199584 + ... + 5199593.

It is an arithmetic number, because the mean of its divisors is an integer number (15598767).

Almost surely, 2^51995885 is an apocalyptic number.

It is an amenable number.

51995885 is a deficient number, since it is larger than the sum of its proper divisors (10399183).

51995885 is a wasteful number, since it uses less digits than its factorization.

51995885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10399182.

The product of its digits is 648000, while the sum is 50.

The square root of 51995885 is about 7210.8172213696. The cubic root of 51995885 is about 373.2412697275.

The spelling of 51995885 in words is "fifty-one million, nine hundred ninety-five thousand, eight hundred eighty-five".