249453873217 has 2 divisors, whose sum is σ = 249453873218. Its totient is φ = 249453873216.

The previous prime is 249453873157. The next prime is 249453873239. The reversal of 249453873217 is 712378354942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194378701456 + 55075171761 = 440884^2 + 234681^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249453873217 is a prime.

It is not a weakly prime, because it can be changed into another prime (249453873257) 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, 124726936608 + 124726936609.

It is an arithmetic number, because the mean of its divisors is an integer number (124726936609).

Almost surely, 2^249453873217 is an apocalyptic number.

It is an amenable number.

249453873217 is a deficient number, since it is larger than the sum of its proper divisors (1).

249453873217 is an equidigital number, since it uses as much as digits as its factorization.

249453873217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10160640, while the sum is 55.

The spelling of 249453873217 in words is "two hundred forty-nine billion, four hundred fifty-three million, eight hundred seventy-three thousand, two hundred seventeen".