8219643901 has 4 divisors (see below), whose sum is σ = 9393878752. Its totient is φ = 7045409052.

The previous prime is 8219643899. The next prime is 8219643911. The reversal of 8219643901 is 1093469128.

It is a happy number.

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 8219643901 - 2¹ = 8219643899 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 (8219643911) 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, 587117415 + ... + 587117428.

It is an arithmetic number, because the mean of its divisors is an integer number (2348469688).

Almost surely, 2^8219643901 is an apocalyptic number.

It is an amenable number.

8219643901 is a deficient number, since it is larger than the sum of its proper divisors (1174234851).

8219643901 is a wasteful number, since it uses less digits than its factorization.

8219643901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174234850.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 8219643901 is about 90662.2517975370. The cubic root of 8219643901 is about 2018.1386556838.

The spelling of 8219643901 in words is "eight billion, two hundred nineteen million, six hundred forty-three thousand, nine hundred one".