249999889 has 2 divisors, whose sum is σ = 249999890. Its totient is φ = 249999888.

The previous prime is 249999877. The next prime is 249999917. The reversal of 249999889 is 988999942.

249999889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197683600 + 52316289 = 14060^2 + 7233^2 .

It is a cyclic number.

It is not a de Polignac number, because 249999889 - 2²¹ = 247902737 is a prime.

It is not a weakly prime, because it can be changed into another prime (249999809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124999944 + 124999945.

It is an arithmetic number, because the mean of its divisors is an integer number (124999945).

Almost surely, 2^249999889 is an apocalyptic number.

It is an amenable number.

249999889 is a deficient number, since it is larger than the sum of its proper divisors (1).

249999889 is an equidigital number, since it uses as much as digits as its factorization.

249999889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30233088, while the sum is 67.

The square root of 249999889 is about 15811.3847907133. The cubic root of 249999889 is about 629.9604317133.

The spelling of 249999889 in words is "two hundred forty-nine million, nine hundred ninety-nine thousand, eight hundred eighty-nine".