51856523 has 2 divisors, whose sum is σ = 51856524. Its totient is φ = 51856522.

The previous prime is 51856517. The next prime is 51856543. The reversal of 51856523 is 32565815.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51856523 - 2¹⁰ = 51855499 is a prime.

It is a nialpdrome in base 13.

It is not a weakly prime, because it can be changed into another prime (51856543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25928261 + 25928262.

It is an arithmetic number, because the mean of its divisors is an integer number (25928262).

Almost surely, 2^51856523 is an apocalyptic number.

51856523 is a deficient number, since it is larger than the sum of its proper divisors (1).

51856523 is an equidigital number, since it uses as much as digits as its factorization.

51856523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36000, while the sum is 35.

The square root of 51856523 is about 7201.1473391398. The cubic root of 51856523 is about 372.9075113233.

The spelling of 51856523 in words is "fifty-one million, eight hundred fifty-six thousand, five hundred twenty-three".