245591 has 2 divisors, whose sum is σ = 245592. Its totient is φ = 245590.

The previous prime is 245587. The next prime is 245593. The reversal of 245591 is 195542.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 245591 - 2² = 245587 is a prime.

Together with 245593, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 245591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122795 + 122796.

It is an arithmetic number, because the mean of its divisors is an integer number (122796).

2²⁴⁵⁵⁹¹ is an apocalyptic number.

245591 is a deficient number, since it is larger than the sum of its proper divisors (1).

245591 is an equidigital number, since it uses as much as digits as its factorization.

245591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 26.

The square root of 245591 is about 495.5713873904. The cubic root of 245591 is about 62.6235210533.

The spelling of 245591 in words is "two hundred forty-five thousand, five hundred ninety-one".