245851 has 2 divisors, whose sum is σ = 245852. Its totient is φ = 245850.

The previous prime is 245849. The next prime is 245863. The reversal of 245851 is 158542.

245851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 245851 - 2¹ = 245849 is a prime.

Together with 245849, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (245821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122925 + 122926.

It is an arithmetic number, because the mean of its divisors is an integer number (122926).

2²⁴⁵⁸⁵¹ is an apocalyptic number.

245851 is a deficient number, since it is larger than the sum of its proper divisors (1).

245851 is an equidigital number, since it uses as much as digits as its factorization.

245851 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1600, while the sum is 25.

The square root of 245851 is about 495.8336414565. The cubic root of 245851 is about 62.6456124886.

The spelling of 245851 in words is "two hundred forty-five thousand, eight hundred fifty-one".