249147909 has 24 divisors (see below), whose sum is σ = 367203200. Its totient is φ = 162751680.

The previous prime is 249147907. The next prime is 249147917. The reversal of 249147909 is 909741942.

It is a happy number.

249147909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 249147909 - 2¹ = 249147907 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249147901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 97569 + ... + 100089.

Almost surely, 2^249147909 is an apocalyptic number.

It is an amenable number.

249147909 is a deficient number, since it is larger than the sum of its proper divisors (118055291).

249147909 is a wasteful number, since it uses less digits than its factorization.

249147909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2745 (or 2742 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 249147909 is about 15784.4198182892. The cubic root of 249147909 is about 629.2439986775.

It can be divided in two parts, 24914 and 7909, that added together give a palindrome (32823).

The spelling of 249147909 in words is "two hundred forty-nine million, one hundred forty-seven thousand, nine hundred nine".