245280689 has 2 divisors, whose sum is σ = 245280690. Its totient is φ = 245280688.

The previous prime is 245280667. The next prime is 245280691. The reversal of 245280689 is 986082542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156450064 + 88830625 = 12508^2 + 9425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245280689 is a prime.

Together with 245280691, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (245280619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122640344 + 122640345.

It is an arithmetic number, because the mean of its divisors is an integer number (122640345).

Almost surely, 2^245280689 is an apocalyptic number.

It is an amenable number.

245280689 is a deficient number, since it is larger than the sum of its proper divisors (1).

245280689 is an equidigital number, since it uses as much as digits as its factorization.

245280689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 276480, while the sum is 44.

The square root of 245280689 is about 15661.4395570778. The cubic root of 245280689 is about 625.9713442159.

The spelling of 245280689 in words is "two hundred forty-five million, two hundred eighty thousand, six hundred eighty-nine".