249688609 has 2 divisors, whose sum is σ = 249688610. Its totient is φ = 249688608.

The previous prime is 249688603. The next prime is 249688643. The reversal of 249688609 is 906886942.

249688609 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., 188457984 + 61230625 = 13728^2 + 7825^2 .

It is a cyclic number.

It is not a de Polignac number, because 249688609 - 2⁵ = 249688577 is a prime.

It is not a weakly prime, because it can be changed into another prime (249688603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124844304 + 124844305.

It is an arithmetic number, because the mean of its divisors is an integer number (124844305).

Almost surely, 2^249688609 is an apocalyptic number.

It is an amenable number.

249688609 is a deficient number, since it is larger than the sum of its proper divisors (1).

249688609 is an equidigital number, since it uses as much as digits as its factorization.

249688609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1492992, while the sum is 52.

The square root of 249688609 is about 15801.5381846199. The cubic root of 249688609 is about 629.6988642285.

The spelling of 249688609 in words is "two hundred forty-nine million, six hundred eighty-eight thousand, six hundred nine".