249220817 has 2 divisors, whose sum is σ = 249220818. Its totient is φ = 249220816.

The previous prime is 249220813. The next prime is 249220841. The reversal of 249220817 is 718022942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221384641 + 27836176 = 14879^2 + 5276^2 .

It is a cyclic number.

It is not a de Polignac number, because 249220817 - 2² = 249220813 is a prime.

It is a super-2 number, since 2×249220817² = 124222031252294978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (249220813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124610408 + 124610409.

It is an arithmetic number, because the mean of its divisors is an integer number (124610409).

Almost surely, 2^249220817 is an apocalyptic number.

It is an amenable number.

249220817 is a deficient number, since it is larger than the sum of its proper divisors (1).

249220817 is an equidigital number, since it uses as much as digits as its factorization.

249220817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 249220817 is about 15786.7291419090. The cubic root of 249220817 is about 629.3053711200.

The spelling of 249220817 in words is "two hundred forty-nine million, two hundred twenty thousand, eight hundred seventeen".