51775 has 12 divisors (see below), whose sum is σ = 68200.
Its totient is φ = 38880.
The previous prime is 51769. The next prime is 51787. The reversal of 51775 is 57715.
It is not a de Polignac number, because 51775 - 23 = 51767 is a prime.
It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.
It is a Harshad number since it is a multiple of its sum of digits (25).
It is a plaindrome in base 11.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 421 + ... + 529.
251775 is an apocalyptic number.
51775 is a deficient number, since it is larger than the sum of its proper divisors (16425).
51775 is a wasteful number, since it uses less digits than its factorization.
51775 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 138 (or 133 counting only the distinct ones).
The product of its digits is 1225, while the sum is 25.
The square root of 51775 is about 227.5412050597.
The cubic root of 51775 is about 37.2711994398.
The spelling of 51775 in words is "fifty-one thousand, seven hundred seventy-five".