245649 has 4 divisors (see below), whose sum is σ = 327536. Its totient is φ = 163764.

The previous prime is 245639. The next prime is 245653. The reversal of 245649 is 946542.

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 245649 - 2⁷ = 245521 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

245649 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (245629) 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, 40939 + ... + 40944.

It is an arithmetic number, because the mean of its divisors is an integer number (81884).

2²⁴⁵⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

245649 is a deficient number, since it is larger than the sum of its proper divisors (81887).

245649 is an equidigital number, since it uses as much as digits as its factorization.

245649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81886.

The product of its digits is 8640, while the sum is 30.

The square root of 245649 is about 495.6299022456. The cubic root of 245649 is about 62.6284504933.

The spelling of 245649 in words is "two hundred forty-five thousand, six hundred forty-nine".