51197 has 2 divisors, whose sum is σ = 51198.
Its totient is φ = 51196.
The previous prime is 51193. The next prime is 51199. The reversal of 51197 is 79115.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 51076 + 121 = 226^2 + 11^2
It is a cyclic number.
It is not a de Polignac number, because 51197 - 22 = 51193 is a prime.
It is a super-2 number, since 2×511972 = 5242265618, which contains 22 as substring.
Together with 51199, 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 (51193) by changing a digit.
It is a good prime.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25598 + 25599.
It is an arithmetic number, because the mean of its divisors is an integer number (25599).
251197 is an apocalyptic number.
It is an amenable number.
51197 is a deficient number, since it is larger than the sum of its proper divisors (1).
51197 is an equidigital number, since it uses as much as digits as its factorization.
51197 is an evil number, because the sum of its binary digits is even.
The product of its digits is 315, while the sum is 23.
The square root of 51197 is about 226.2675407565.
The cubic root of 51197 is about 37.1319854065.
The spelling of 51197 in words is "fifty-one thousand, one hundred ninety-seven".