249168649 has 4 divisors (see below), whose sum is σ = 249564160. Its totient is φ = 248773140.

The previous prime is 249168631. The next prime is 249168671. The reversal of 249168649 is 946861942.

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 249168649 - 2¹¹ = 249166601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249168629) 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, 196809 + ... + 198070.

It is an arithmetic number, because the mean of its divisors is an integer number (62391040).

Almost surely, 2^249168649 is an apocalyptic number.

It is an amenable number.

249168649 is a deficient number, since it is larger than the sum of its proper divisors (395511).

249168649 is an equidigital number, since it uses as much as digits as its factorization.

249168649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395510.

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

The square root of 249168649 is about 15785.0767815681. The cubic root of 249168649 is about 629.2614583978.

The spelling of 249168649 in words is "two hundred forty-nine million, one hundred sixty-eight thousand, six hundred forty-nine".