249876321 has 4 divisors (see below), whose sum is σ = 333168432. Its totient is φ = 166584212.

The previous prime is 249876317. The next prime is 249876329. The reversal of 249876321 is 123678942.

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 249876321 - 2² = 249876317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (249876329) 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, 41646051 + ... + 41646056.

It is an arithmetic number, because the mean of its divisors is an integer number (83292108).

Almost surely, 2^249876321 is an apocalyptic number.

It is an amenable number.

249876321 is a deficient number, since it is larger than the sum of its proper divisors (83292111).

249876321 is an equidigital number, since it uses as much as digits as its factorization.

249876321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83292110.

The product of its digits is 145152, while the sum is 42.

The square root of 249876321 is about 15807.4767436172. The cubic root of 249876321 is about 629.8566239614.

The spelling of 249876321 in words is "two hundred forty-nine million, eight hundred seventy-six thousand, three hundred twenty-one".