51551 has 2 divisors, whose sum is σ = 51552.
Its totient is φ = 51550.
The previous prime is 51539. The next prime is 51563. The reversal of 51551 is 15515.
It is a balanced prime because it is at equal distance from previous prime (51539) and next prime (51563).
It is a cyclic number.
It is not a de Polignac number, because 51551 - 26 = 51487 is a prime.
It is a Chen prime.
It is a plaindrome in base 12.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (51511) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25775 + 25776.
It is an arithmetic number, because the mean of its divisors is an integer number (25776).
251551 is an apocalyptic number.
51551 is a deficient number, since it is larger than the sum of its proper divisors (1).
51551 is an equidigital number, since it uses as much as digits as its factorization.
51551 is an evil number, because the sum of its binary digits is even.
The product of its digits is 125, while the sum is 17.
The square root of 51551 is about 227.0484529787.
The cubic root of 51551 is about 37.2173715452.
The spelling of 51551 in words is "fifty-one thousand, five hundred fifty-one".