3817743221 has 4 divisors (see below), whose sum is σ = 3826855200. Its totient is φ = 3808631244.

The previous prime is 3817743211. The next prime is 3817743233. The reversal of 3817743221 is 1223477183.

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 a de Polignac number, because none of the positive numbers 2^k-3817743221 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 (3817743211) 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, 4555361 + ... + 4556198.

It is an arithmetic number, because the mean of its divisors is an integer number (956713800).

Almost surely, 2^3817743221 is an apocalyptic number.

It is an amenable number.

3817743221 is a deficient number, since it is larger than the sum of its proper divisors (9111979).

3817743221 is an equidigital number, since it uses as much as digits as its factorization.

3817743221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9111978.

The product of its digits is 56448, while the sum is 38.

The square root of 3817743221 is about 61787.8889508292. Note that the first 3 decimals coincide. The cubic root of 3817743221 is about 1562.9157638006.

The spelling of 3817743221 in words is "three billion, eight hundred seventeen million, seven hundred forty-three thousand, two hundred twenty-one".