245541 has 4 divisors (see below), whose sum is σ = 327392. Its totient is φ = 163692.

The previous prime is 245533. The next prime is 245561. The reversal of 245541 is 145542.

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 245541 - 2³ = 245533 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 245541.

It is not an unprimeable number, because it can be changed into a prime (245501) 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, 40921 + ... + 40926.

It is an arithmetic number, because the mean of its divisors is an integer number (81848).

2²⁴⁵⁵⁴¹ is an apocalyptic number.

It is an amenable number.

245541 is a deficient number, since it is larger than the sum of its proper divisors (81851).

245541 is an equidigital number, since it uses as much as digits as its factorization.

245541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81850.

The product of its digits is 800, while the sum is 21.

The square root of 245541 is about 495.5209380036. The cubic root of 245541 is about 62.6192709131.

Subtracting from 245541 its reverse (145542), we obtain a palindrome (99999).

It can be divided in two parts, 24 and 5541, that added together give a triangular number (5565 = T₁₀₅).

The spelling of 245541 in words is "two hundred forty-five thousand, five hundred forty-one".