244921813 has 4 divisors (see below), whose sum is σ = 248371488. Its totient is φ = 241472140.

The previous prime is 244921811. The next prime is 244921819. The reversal of 244921813 is 318129442.

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, and also an emirpimes, since its reverse is a distinct semiprime: 318129442 = 2 ⋅159064721.

It is a cyclic number.

It is not a de Polignac number, because 244921813 - 2¹ = 244921811 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 (244921811) 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, 1724731 + ... + 1724872.

It is an arithmetic number, because the mean of its divisors is an integer number (62092872).

Almost surely, 2^244921813 is an apocalyptic number.

It is an amenable number.

244921813 is a deficient number, since it is larger than the sum of its proper divisors (3449675).

244921813 is an equidigital number, since it uses as much as digits as its factorization.

244921813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3449674.

The product of its digits is 13824, while the sum is 34.

The square root of 244921813 is about 15649.9780511028. The cubic root of 244921813 is about 625.6659040230.

The spelling of 244921813 in words is "two hundred forty-four million, nine hundred twenty-one thousand, eight hundred thirteen".