245281 has 4 divisors (see below), whose sum is σ = 249364. Its totient is φ = 241200.

The previous prime is 245279. The next prime is 245291. The reversal of 245281 is 182542.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11025 + 234256 = 105^2 + 484^2 .

It is a cyclic number.

It is not a de Polignac number, because 245281 - 2¹ = 245279 is a prime.

It is a super-2 number, since 2×245281² = 120325537922, which contains 22 as substring.

It is a Duffinian number.

245281 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (245251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1950 + ... + 2071.

It is an arithmetic number, because the mean of its divisors is an integer number (62341).

2²⁴⁵²⁸¹ is an apocalyptic number.

It is an amenable number.

245281 is a deficient number, since it is larger than the sum of its proper divisors (4083).

245281 is an equidigital number, since it uses as much as digits as its factorization.

245281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4082.

The product of its digits is 640, while the sum is 22.

The square root of 245281 is about 495.2585183518. The cubic root of 245281 is about 62.5971608780.

The spelling of 245281 in words is "two hundred forty-five thousand, two hundred eighty-one".