245545 has 4 divisors (see below), whose sum is σ = 294660. Its totient is φ = 196432.

The previous prime is 245533. The next prime is 245561. The reversal of 245545 is 545542.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 545542 = 2 ⋅272771.

It can be written as a sum of positive squares in 2 ways, for example, as 61504 + 184041 = 248^2 + 429^2 .

It is a cyclic number.

It is not a de Polignac number, because 245545 - 2⁵ = 245513 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24550 + ... + 24559.

It is an arithmetic number, because the mean of its divisors is an integer number (73665).

2²⁴⁵⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

245545 is a deficient number, since it is larger than the sum of its proper divisors (49115).

245545 is an equidigital number, since it uses as much as digits as its factorization.

245545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49114.

The product of its digits is 4000, while the sum is 25.

The square root of 245545 is about 495.5249741436. The cubic root of 245545 is about 62.6196109455.

It can be divided in two parts, 2455 and 45, that added together give a square (2500 = 50²).

The spelling of 245545 in words is "two hundred forty-five thousand, five hundred forty-five".