249249919 has 8 divisors (see below), whose sum is σ = 260479872. Its totient is φ = 238052760.

The previous prime is 249249893. The next prime is 249249941. The reversal of 249249919 is 919942942.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-249249919 is a prime.

It is a super-2 number, since 2×249249919² = 124251044243013122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249249989) 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 7 ways as a sum of consecutive naturals, for example, 8052 + ... + 23734.

It is an arithmetic number, because the mean of its divisors is an integer number (32559984).

Almost surely, 2^249249919 is an apocalyptic number.

249249919 is a deficient number, since it is larger than the sum of its proper divisors (11229953).

249249919 is a wasteful number, since it uses less digits than its factorization.

249249919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16397.

The product of its digits is 419904, while the sum is 49.

The square root of 249249919 is about 15787.6508385510. The cubic root of 249249919 is about 629.3298652378.

It can be divided in two parts, 24924 and 9919, that added together give a palindrome (34843).

The spelling of 249249919 in words is "two hundred forty-nine million, two hundred forty-nine thousand, nine hundred nineteen".