245563 has 2 divisors, whose sum is σ = 245564. Its totient is φ = 245562.

The previous prime is 245561. The next prime is 245587. The reversal of 245563 is 365542.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 245563 - 2¹ = 245561 is a prime.

Together with 245561, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (245561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122781 + 122782.

It is an arithmetic number, because the mean of its divisors is an integer number (122782).

2²⁴⁵⁵⁶³ is an apocalyptic number.

245563 is a deficient number, since it is larger than the sum of its proper divisors (1).

245563 is an equidigital number, since it uses as much as digits as its factorization.

245563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3600, while the sum is 25.

The square root of 245563 is about 495.5431363666. The cubic root of 245563 is about 62.6211410458.

It can be divided in two parts, 245 and 563, that added together give a palindrome (808).

The spelling of 245563 in words is "two hundred forty-five thousand, five hundred sixty-three".