51555223 has 2 divisors, whose sum is σ = 51555224. Its totient is φ = 51555222.

The previous prime is 51555221. The next prime is 51555253. The reversal of 51555223 is 32255515.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51555223 - 2¹ = 51555221 is a prime.

Together with 51555221, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 51555191 and 51555200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51555221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25777611 + 25777612.

It is an arithmetic number, because the mean of its divisors is an integer number (25777612).

Almost surely, 2^51555223 is an apocalyptic number.

51555223 is a deficient number, since it is larger than the sum of its proper divisors (1).

51555223 is an equidigital number, since it uses as much as digits as its factorization.

51555223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7500, while the sum is 28.

The square root of 51555223 is about 7180.1965850525. The cubic root of 51555223 is about 372.1838778583.

The spelling of 51555223 in words is "fifty-one million, five hundred fifty-five thousand, two hundred twenty-three".