51869 has 2 divisors, whose sum is σ = 51870. Its totient is φ = 51868.

The previous prime is 51859. The next prime is 51871. The reversal of 51869 is 96815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34969 + 16900 = 187^2 + 130^2 .

It is a cyclic number.

It is not a de Polignac number, because 51869 - 2⁴ = 51853 is a prime.

It is a super-2 number, since 2×51869² = 5380786322, which contains 22 as substring.

Together with 51871, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25934 + 25935.

It is an arithmetic number, because the mean of its divisors is an integer number (25935).

2⁵¹⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

51869 is a deficient number, since it is larger than the sum of its proper divisors (1).

51869 is an equidigital number, since it uses as much as digits as its factorization.

51869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 29.

The square root of 51869 is about 227.7476673865. The cubic root of 51869 is about 37.2937416876.

The spelling of 51869 in words is "fifty-one thousand, eight hundred sixty-nine".