249734991 has 16 divisors (see below), whose sum is σ = 364158720. Its totient is φ = 150976320.

The previous prime is 249734963. The next prime is 249735007. The reversal of 249734991 is 199437942.

It is a happy number.

It is not a de Polignac number, because 249734991 - 2¹⁵ = 249702223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 249734991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249734911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4246 + ... + 22748.

It is an arithmetic number, because the mean of its divisors is an integer number (22759920).

Almost surely, 2^249734991 is an apocalyptic number.

249734991 is a deficient number, since it is larger than the sum of its proper divisors (114423729).

249734991 is a wasteful number, since it uses less digits than its factorization.

249734991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18926.

The product of its digits is 489888, while the sum is 48.

The square root of 249734991 is about 15803.0057583993. The cubic root of 249734991 is about 629.7378526370.

The spelling of 249734991 in words is "two hundred forty-nine million, seven hundred thirty-four thousand, nine hundred ninety-one".