249865520213 has 2 divisors, whose sum is σ = 249865520214. Its totient is φ = 249865520212.

The previous prime is 249865520189. The next prime is 249865520227. The reversal of 249865520213 is 312025568942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225517662769 + 24347857444 = 474887^2 + 156038^2 .

It is a cyclic number.

It is not a de Polignac number, because 249865520213 - 2²⁸ = 249597084757 is a prime.

It is a super-2 number, since 2×249865520213² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249865525213) 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, 124932760106 + 124932760107.

It is an arithmetic number, because the mean of its divisors is an integer number (124932760107).

Almost surely, 2^249865520213 is an apocalyptic number.

It is an amenable number.

249865520213 is a deficient number, since it is larger than the sum of its proper divisors (1).

249865520213 is an equidigital number, since it uses as much as digits as its factorization.

249865520213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1036800, while the sum is 47.

The spelling of 249865520213 in words is "two hundred forty-nine billion, eight hundred sixty-five million, five hundred twenty thousand, two hundred thirteen".