249972517 has 2 divisors, whose sum is σ = 249972518. Its totient is φ = 249972516.

The previous prime is 249972421. The next prime is 249972521. The reversal of 249972517 is 715279942.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 147841281 + 102131236 = 12159^2 + 10106^2 .

It is a cyclic number.

It is not a de Polignac number, because 249972517 - 2¹⁹ = 249448229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249972577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124986258 + 124986259.

It is an arithmetic number, because the mean of its divisors is an integer number (124986259).

Almost surely, 2^249972517 is an apocalyptic number.

It is an amenable number.

249972517 is a deficient number, since it is larger than the sum of its proper divisors (1).

249972517 is an equidigital number, since it uses as much as digits as its factorization.

249972517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 46.

The square root of 249972517 is about 15810.5191881861. The cubic root of 249972517 is about 629.9374398280.

The spelling of 249972517 in words is "two hundred forty-nine million, nine hundred seventy-two thousand, five hundred seventeen".