249709289 has 2 divisors, whose sum is σ = 249709290. Its totient is φ = 249709288.

The previous prime is 249709279. The next prime is 249709297. The reversal of 249709289 is 982907942.

249709289 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., 240498064 + 9211225 = 15508^2 + 3035^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249709289 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (249709259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124854644 + 124854645.

It is an arithmetic number, because the mean of its divisors is an integer number (124854645).

Almost surely, 2^249709289 is an apocalyptic number.

It is an amenable number.

249709289 is a deficient number, since it is larger than the sum of its proper divisors (1).

249709289 is an equidigital number, since it uses as much as digits as its factorization.

249709289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 249709289 is about 15802.1925377461. The cubic root of 249709289 is about 629.7162482989.

The spelling of 249709289 in words is "two hundred forty-nine million, seven hundred nine thousand, two hundred eighty-nine".