249332821 has 4 divisors (see below), whose sum is σ = 251753632. Its totient is φ = 246912012.

The previous prime is 249332819. The next prime is 249332873. The reversal of 249332821 is 128233942.

It is a happy number.

249332821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 249332821 - 2¹ = 249332819 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 (249332891) 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, 1210251 + ... + 1210456.

It is an arithmetic number, because the mean of its divisors is an integer number (62938408).

Almost surely, 2^249332821 is an apocalyptic number.

It is an amenable number.

249332821 is a deficient number, since it is larger than the sum of its proper divisors (2420811).

249332821 is a wasteful number, since it uses less digits than its factorization.

249332821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2420810.

The product of its digits is 20736, while the sum is 34.

The square root of 249332821 is about 15790.2761533800. The cubic root of 249332821 is about 629.3996304510.

The spelling of 249332821 in words is "two hundred forty-nine million, three hundred thirty-two thousand, eight hundred twenty-one".