249473621 has 4 divisors (see below), whose sum is σ = 252045612. Its totient is φ = 246901632.

The previous prime is 249473579. The next prime is 249473633. The reversal of 249473621 is 126374942.

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

It can be written as a sum of positive squares in 2 ways, for example, as 173870596 + 75603025 = 13186^2 + 8695^2 .

It is a cyclic number.

It is not a de Polignac number, because 249473621 - 2¹⁴ = 249457237 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 (249473821) 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 3 ways as a sum of consecutive naturals, for example, 1285850 + ... + 1286043.

It is an arithmetic number, because the mean of its divisors is an integer number (63011403).

Almost surely, 2^249473621 is an apocalyptic number.

It is an amenable number.

249473621 is a deficient number, since it is larger than the sum of its proper divisors (2571991).

249473621 is an equidigital number, since it uses as much as digits as its factorization.

249473621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2571990.

The product of its digits is 72576, while the sum is 38.

The square root of 249473621 is about 15794.7339642047. The cubic root of 249473621 is about 629.5180836247.

The spelling of 249473621 in words is "two hundred forty-nine million, four hundred seventy-three thousand, six hundred twenty-one".