249497609 has 2 divisors, whose sum is σ = 249497610. Its totient is φ = 249497608.

The previous prime is 249497581. The next prime is 249497617. The reversal of 249497609 is 906794942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135606025 + 113891584 = 11645^2 + 10672^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249497609 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (249497639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124748804 + 124748805.

It is an arithmetic number, because the mean of its divisors is an integer number (124748805).

Almost surely, 2^249497609 is an apocalyptic number.

It is an amenable number.

249497609 is a deficient number, since it is larger than the sum of its proper divisors (1).

249497609 is an equidigital number, since it uses as much as digits as its factorization.

249497609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 50.

The square root of 249497609 is about 15795.4933129675. The cubic root of 249497609 is about 629.5382599674.

The spelling of 249497609 in words is "two hundred forty-nine million, four hundred ninety-seven thousand, six hundred nine".