249868789 has 2 divisors, whose sum is σ = 249868790. Its totient is φ = 249868788.

The previous prime is 249868777. The next prime is 249868793. The reversal of 249868789 is 987868942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188512900 + 61355889 = 13730^2 + 7833^2 .

It is a cyclic number.

It is not a de Polignac number, because 249868789 - 2²¹ = 247771637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249868739) 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, 124934394 + 124934395.

It is an arithmetic number, because the mean of its divisors is an integer number (124934395).

Almost surely, 2^249868789 is an apocalyptic number.

It is an amenable number.

249868789 is a deficient number, since it is larger than the sum of its proper divisors (1).

249868789 is an equidigital number, since it uses as much as digits as its factorization.

249868789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13934592, while the sum is 61.

The square root of 249868789 is about 15807.2385001302. The cubic root of 249868789 is about 629.8502953268.

The spelling of 249868789 in words is "two hundred forty-nine million, eight hundred sixty-eight thousand, seven hundred eighty-nine".