51897 has 4 divisors (see below), whose sum is σ = 69200. Its totient is φ = 34596.

The previous prime is 51893. The next prime is 51899. The reversal of 51897 is 79815.

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 not a de Polignac number, because 51897 - 2² = 51893 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51893) 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, 8647 + ... + 8652.

It is an arithmetic number, because the mean of its divisors is an integer number (17300).

2⁵¹⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

51897 is a deficient number, since it is larger than the sum of its proper divisors (17303).

51897 is a wasteful number, since it uses less digits than its factorization.

51897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17302.

The product of its digits is 2520, while the sum is 30.

The square root of 51897 is about 227.8091306335. The cubic root of 51897 is about 37.3004511346.

The spelling of 51897 in words is "fifty-one thousand, eight hundred ninety-seven".