7981249 has 4 divisors (see below), whose sum is σ = 7988436. Its totient is φ = 7974064.

The previous prime is 7981247. The next prime is 7981283. The reversal of 7981249 is 9421897.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9421897 = 29 ⋅324893.

It can be written as a sum of positive squares in 2 ways, for example, as 7059649 + 921600 = 2657^2 + 960^2 .

It is a cyclic number.

It is not a de Polignac number, because 7981249 - 2¹ = 7981247 is a prime.

It is a Duffinian number.

7981249 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7981247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1534 + ... + 4279.

It is an arithmetic number, because the mean of its divisors is an integer number (1997109).

Almost surely, 2^7981249 is an apocalyptic number.

It is an amenable number.

7981249 is a deficient number, since it is larger than the sum of its proper divisors (7187).

7981249 is a wasteful number, since it uses less digits than its factorization.

7981249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7186.

The product of its digits is 36288, while the sum is 40.

The square root of 7981249 is about 2825.1104403191. The cubic root of 7981249 is about 199.8436194241.

The spelling of 7981249 in words is "seven million, nine hundred eighty-one thousand, two hundred forty-nine".