249888749 has 4 divisors (see below), whose sum is σ = 272605920. Its totient is φ = 227171580.

The previous prime is 249888731. The next prime is 249888773. The reversal of 249888749 is 947888942.

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 249888749 - 2²⁴ = 233111533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249888449) 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, 11358569 + ... + 11358590.

It is an arithmetic number, because the mean of its divisors is an integer number (68151480).

Almost surely, 2^249888749 is an apocalyptic number.

It is an amenable number.

249888749 is a deficient number, since it is larger than the sum of its proper divisors (22717171).

249888749 is a wasteful number, since it uses less digits than its factorization.

249888749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22717170.

The product of its digits is 9289728, while the sum is 59.

The square root of 249888749 is about 15807.8698438468. The cubic root of 249888749 is about 629.8670660984.

The spelling of 249888749 in words is "two hundred forty-nine million, eight hundred eighty-eight thousand, seven hundred forty-nine".