249861253 has 2 divisors, whose sum is σ = 249861254. Its totient is φ = 249861252.

The previous prime is 249861247. The next prime is 249861281. The reversal of 249861253 is 352168942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249861249 + 4 = 15807^2 + 2^2 .

It is a cyclic number.

It is not a de Polignac number, because 249861253 - 2¹³ = 249853061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249861203) 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, 124930626 + 124930627.

It is an arithmetic number, because the mean of its divisors is an integer number (124930627).

Almost surely, 2^249861253 is an apocalyptic number.

It is an amenable number.

249861253 is a deficient number, since it is larger than the sum of its proper divisors (1).

249861253 is an equidigital number, since it uses as much as digits as its factorization.

249861253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 40.

The square root of 249861253 is about 15807.0001265262. Note that the first 3 decimals coincide. The cubic root of 249861253 is about 629.8439632040.

The spelling of 249861253 in words is "two hundred forty-nine million, eight hundred sixty-one thousand, two hundred fifty-three".