249678319 has 4 divisors (see below), whose sum is σ = 272376360. Its totient is φ = 226980280.

The previous prime is 249678311. The next prime is 249678361. The reversal of 249678319 is 913876942.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 249678319 - 2³ = 249678311 is a prime.

It is a super-2 number, since 2×249678319² = 124678525957331522, 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 (249678311) 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, 11349004 + ... + 11349025.

It is an arithmetic number, because the mean of its divisors is an integer number (68094090).

Almost surely, 2^249678319 is an apocalyptic number.

249678319 is a deficient number, since it is larger than the sum of its proper divisors (22698041).

249678319 is a wasteful number, since it uses less digits than its factorization.

249678319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22698040.

The product of its digits is 653184, while the sum is 49.

The square root of 249678319 is about 15801.2125800522. The cubic root of 249678319 is about 629.6902138668.

The spelling of 249678319 in words is "two hundred forty-nine million, six hundred seventy-eight thousand, three hundred nineteen".