2249781445249 has 4 divisors (see below), whose sum is σ = 2422841556436. Its totient is φ = 2076721334064.

The previous prime is 2249781445243. The next prime is 2249781445337. The reversal of 2249781445249 is 9425441879422.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1123667841024 + 1126113604225 = 1060032^2 + 1061185^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2249781445249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2249781445243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86530055574 + ... + 86530055599.

It is an arithmetic number, because the mean of its divisors is an integer number (605710389109).

Almost surely, 2^{2249781445249} is an apocalyptic number.

It is an amenable number.

2249781445249 is a deficient number, since it is larger than the sum of its proper divisors (173060111187).

2249781445249 is a wasteful number, since it uses less digits than its factorization.

2249781445249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173060111186.

The product of its digits is 46448640, while the sum is 61.

The spelling of 2249781445249 in words is "two trillion, two hundred forty-nine billion, seven hundred eighty-one million, four hundred forty-five thousand, two hundred forty-nine".