249659749 has 2 divisors, whose sum is σ = 249659750. Its totient is φ = 249659748.

The previous prime is 249659719. The next prime is 249659759. The reversal of 249659749 is 947956942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 233539524 + 16120225 = 15282^2 + 4015^2 .

It is a cyclic number.

It is not a de Polignac number, because 249659749 - 2⁹ = 249659237 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 249659749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249659719) 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, 124829874 + 124829875.

It is an arithmetic number, because the mean of its divisors is an integer number (124829875).

Almost surely, 2^249659749 is an apocalyptic number.

It is an amenable number.

249659749 is a deficient number, since it is larger than the sum of its proper divisors (1).

249659749 is an equidigital number, since it uses as much as digits as its factorization.

249659749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4898880, while the sum is 55.

The square root of 249659749 is about 15800.6249559946. The cubic root of 249659749 is about 629.6746022628.

The spelling of 249659749 in words is "two hundred forty-nine million, six hundred fifty-nine thousand, seven hundred forty-nine".