245724889 has 2 divisors, whose sum is σ = 245724890. Its totient is φ = 245724888.

The previous prime is 245724887. The next prime is 245724901. The reversal of 245724889 is 988427542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 173185600 + 72539289 = 13160^2 + 8517^2 .

It is a cyclic number.

It is not a de Polignac number, because 245724889 - 2¹ = 245724887 is a prime.

Together with 245724887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (245724887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122862444 + 122862445.

It is an arithmetic number, because the mean of its divisors is an integer number (122862445).

Almost surely, 2^245724889 is an apocalyptic number.

It is an amenable number.

245724889 is a deficient number, since it is larger than the sum of its proper divisors (1).

245724889 is an equidigital number, since it uses as much as digits as its factorization.

245724889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1290240, while the sum is 49.

The square root of 245724889 is about 15675.6144696149. The cubic root of 245724889 is about 626.3489915401.

The spelling of 245724889 in words is "two hundred forty-five million, seven hundred twenty-four thousand, eight hundred eighty-nine".