245669 has 4 divisors (see below), whose sum is σ = 250944. Its totient is φ = 240396.

The previous prime is 245653. The next prime is 245671. The reversal of 245669 is 966542.

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 a cyclic number.

It is not a de Polignac number, because 245669 - 2⁴ = 245653 is a prime.

It is a super-2 number, since 2×245669² = 120706515122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2567 + ... + 2660.

It is an arithmetic number, because the mean of its divisors is an integer number (62736).

2²⁴⁵⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

245669 is a deficient number, since it is larger than the sum of its proper divisors (5275).

245669 is an equidigital number, since it uses as much as digits as its factorization.

245669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5274.

The product of its digits is 12960, while the sum is 32.

The square root of 245669 is about 495.6500781802. The cubic root of 245669 is about 62.6301501203.

The spelling of 245669 in words is "two hundred forty-five thousand, six hundred sixty-nine".