245181 has 4 divisors (see below), whose sum is σ = 326912. Its totient is φ = 163452.

The previous prime is 245177. The next prime is 245183. The reversal of 245181 is 181542.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 245181 - 2² = 245177 is a prime.

It is a super-2 number, since 2×245181² = 120227445522, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245183) 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, 40861 + ... + 40866.

It is an arithmetic number, because the mean of its divisors is an integer number (81728).

2²⁴⁵¹⁸¹ is an apocalyptic number.

It is an amenable number.

245181 is a deficient number, since it is larger than the sum of its proper divisors (81731).

245181 is an equidigital number, since it uses as much as digits as its factorization.

245181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81730.

The product of its digits is 320, while the sum is 21.

The square root of 245181 is about 495.1575506846. The cubic root of 245181 is about 62.5886528579.

The spelling of 245181 in words is "two hundred forty-five thousand, one hundred eighty-one".