245081 has 4 divisors (see below), whose sum is σ = 258000. Its totient is φ = 232164.

The previous prime is 245071. The next prime is 245083. The reversal of 245081 is 180542.

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, and also an emirpimes, since its reverse is a distinct semiprime: 180542 = 2 ⋅90271.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245081 is a prime.

It is a super-2 number, since 2×245081² = 120129393122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245083) 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, 6431 + ... + 6468.

It is an arithmetic number, because the mean of its divisors is an integer number (64500).

2²⁴⁵⁰⁸¹ is an apocalyptic number.

It is an amenable number.

245081 is a deficient number, since it is larger than the sum of its proper divisors (12919).

245081 is a wasteful number, since it uses less digits than its factorization.

245081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12918.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 245081 is about 495.0565624249. The cubic root of 245081 is about 62.5801425242.

The spelling of 245081 in words is "two hundred forty-five thousand, eighty-one".