245839921 has 2 divisors, whose sum is σ = 245839922. Its totient is φ = 245839920.

The previous prime is 245839897. The next prime is 245839927. The reversal of 245839921 is 129938542.

245839921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164839921 + 81000000 = 12839^2 + 9000^2 .

It is a cyclic number.

It is not a de Polignac number, because 245839921 - 2¹¹ = 245837873 is a prime.

It is not a weakly prime, because it can be changed into another prime (245839927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122919960 + 122919961.

It is an arithmetic number, because the mean of its divisors is an integer number (122919961).

Almost surely, 2^245839921 is an apocalyptic number.

It is an amenable number.

245839921 is a deficient number, since it is larger than the sum of its proper divisors (1).

245839921 is an equidigital number, since it uses as much as digits as its factorization.

245839921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 43.

The square root of 245839921 is about 15679.2831787681. The cubic root of 245839921 is about 626.4467145633.

The spelling of 245839921 in words is "two hundred forty-five million, eight hundred thirty-nine thousand, nine hundred twenty-one".