249778249 has 8 divisors (see below), whose sum is σ = 285568448. Its totient is φ = 214014960.

The previous prime is 249778223. The next prime is 249778267. The reversal of 249778249 is 942877942.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 249778249 - 2²⁵ = 216223817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 249778196 and 249778205.

It is not an unprimeable number, because it can be changed into a prime (249778049) 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 in 7 ways as a sum of consecutive naturals, for example, 20554 + ... + 30364.

It is an arithmetic number, because the mean of its divisors is an integer number (35696056).

Almost surely, 2^249778249 is an apocalyptic number.

It is an amenable number.

249778249 is a deficient number, since it is larger than the sum of its proper divisors (35790199).

249778249 is an equidigital number, since it uses as much as digits as its factorization.

249778249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13455.

The product of its digits is 2032128, while the sum is 52.

The square root of 249778249 is about 15804.3743628149. The cubic root of 249778249 is about 629.7742106809.

The spelling of 249778249 in words is "two hundred forty-nine million, seven hundred seventy-eight thousand, two hundred forty-nine".