245641289 has 2 divisors, whose sum is σ = 245641290. Its totient is φ = 245641288.

The previous prime is 245641243. The next prime is 245641309. The reversal of 245641289 is 982146542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 228765625 + 16875664 = 15125^2 + 4108^2 .

It is a cyclic number.

It is not a de Polignac number, because 245641289 - 2¹⁶ = 245575753 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (245641189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122820644 + 122820645.

It is an arithmetic number, because the mean of its divisors is an integer number (122820645).

Almost surely, 2^245641289 is an apocalyptic number.

It is an amenable number.

245641289 is a deficient number, since it is larger than the sum of its proper divisors (1).

245641289 is an equidigital number, since it uses as much as digits as its factorization.

245641289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 41.

The square root of 245641289 is about 15672.9476806375. The cubic root of 245641289 is about 626.2779517752.

The spelling of 245641289 in words is "two hundred forty-five million, six hundred forty-one thousand, two hundred eighty-nine".