245506 has 4 divisors (see below), whose sum is σ = 368262. Its totient is φ = 122752.

The previous prime is 245501. The next prime is 245513. The reversal of 245506 is 605542.

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

It can be written as a sum of positive squares in only one way, i.e., 225625 + 19881 = 475^2 + 141^2 .

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 an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (245501) by changing a digit.

245506 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61375 + ... + 61378.

2²⁴⁵⁵⁰⁶ is an apocalyptic number.

245506 is a deficient number, since it is larger than the sum of its proper divisors (122756).

245506 is a wasteful number, since it uses less digits than its factorization.

245506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122755.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 245506 is about 495.4856203766. The cubic root of 245506 is about 62.6162954716.

The spelling of 245506 in words is "two hundred forty-five thousand, five hundred six".