245747989 has 4 divisors (see below), whose sum is σ = 246682656. Its totient is φ = 244813324.

The previous prime is 245747981. The next prime is 245748017. The reversal of 245747989 is 989747542.

245747989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 245747989 - 2³ = 245747981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245747981) 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, 466939 + ... + 467464.

It is an arithmetic number, because the mean of its divisors is an integer number (61670664).

Almost surely, 2^245747989 is an apocalyptic number.

It is an amenable number.

245747989 is a deficient number, since it is larger than the sum of its proper divisors (934667).

245747989 is an equidigital number, since it uses as much as digits as its factorization.

245747989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934666.

The product of its digits is 5080320, while the sum is 55.

The square root of 245747989 is about 15676.3512655209. The cubic root of 245747989 is about 626.3686181076.

The spelling of 245747989 in words is "two hundred forty-five million, seven hundred forty-seven thousand, nine hundred eighty-nine".