249661849 has 4 divisors (see below), whose sum is σ = 260516736. Its totient is φ = 238806964.

The previous prime is 249661831. The next prime is 249661891. The reversal of 249661849 is 948166942.

249661849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 249661849 - 2¹¹ = 249659801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249661649) 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, 5427409 + ... + 5427454.

It is an arithmetic number, because the mean of its divisors is an integer number (65129184).

Almost surely, 2^249661849 is an apocalyptic number.

It is an amenable number.

249661849 is a deficient number, since it is larger than the sum of its proper divisors (10854887).

249661849 is a wasteful number, since it uses less digits than its factorization.

249661849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10854886.

The product of its digits is 746496, while the sum is 49.

The square root of 249661849 is about 15800.6914089226. The cubic root of 249661849 is about 629.6763677496.

The spelling of 249661849 in words is "two hundred forty-nine million, six hundred sixty-one thousand, eight hundred forty-nine".