51995 has 4 divisors (see below), whose sum is σ = 62400. Its totient is φ = 41592.

The previous prime is 51991. The next prime is 52009. The reversal of 51995 is 59915.

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

It is a cyclic number.

It is not a de Polignac number, because 51995 - 2² = 51991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51991) 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, 5195 + ... + 5204.

It is an arithmetic number, because the mean of its divisors is an integer number (15600).

2⁵¹⁹⁹⁵ is an apocalyptic number.

51995 is a deficient number, since it is larger than the sum of its proper divisors (10405).

51995 is a wasteful number, since it uses less digits than its factorization.

51995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10404.

The product of its digits is 2025, while the sum is 29.

The square root of 51995 is about 228.0241215310. The cubic root of 51995 is about 37.3239152121.

The spelling of 51995 in words is "fifty-one thousand, nine hundred ninety-five".