245881 has 2 divisors, whose sum is σ = 245882. Its totient is φ = 245880.

The previous prime is 245863. The next prime is 245897. The reversal of 245881 is 188542.

245881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129600 + 116281 = 360^2 + 341^2 .

It is a cyclic number.

It is not a de Polignac number, because 245881 - 2⁵ = 245849 is a prime.

It is a super-2 number, since 2×245881² = 120914932322, which contains 22 as substring.

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, 122940 + 122941.

It is an arithmetic number, because the mean of its divisors is an integer number (122941).

2²⁴⁵⁸⁸¹ is an apocalyptic number.

It is an amenable number.

245881 is a deficient number, since it is larger than the sum of its proper divisors (1).

245881 is an equidigital number, since it uses as much as digits as its factorization.

245881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2560, while the sum is 28.

The square root of 245881 is about 495.8638926157. The cubic root of 245881 is about 62.6481604979.

The spelling of 245881 in words is "two hundred forty-five thousand, eight hundred eighty-one".