245047 has 4 divisors (see below), whose sum is σ = 267336. Its totient is φ = 222760.

The previous prime is 245039. The next prime is 245071. The reversal of 245047 is 740542.

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

It is a cyclic number.

It is not a de Polignac number, because 245047 - 2³ = 245039 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11128 + ... + 11149.

It is an arithmetic number, because the mean of its divisors is an integer number (66834).

2²⁴⁵⁰⁴⁷ is an apocalyptic number.

245047 is a deficient number, since it is larger than the sum of its proper divisors (22289).

245047 is a wasteful number, since it uses less digits than its factorization.

245047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22288.

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 245047 is about 495.0222217234. The cubic root of 245047 is about 62.5772484834.

Subtracting from 245047 its sum of digits (22), we obtain a square (245025 = 495²).

Adding to 245047 its reverse (740542), we get a palindrome (985589).

The spelling of 245047 in words is "two hundred forty-five thousand, forty-seven".