8219011894 has 4 divisors (see below), whose sum is σ = 12328517844. Its totient is φ = 4109505946.

The previous prime is 8219011877. The next prime is 8219011903. The reversal of 8219011894 is 4981109128.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 8219011894.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2054752972 + ... + 2054752975.

It is an arithmetic number, because the mean of its divisors is an integer number (3082129461).

Almost surely, 2^8219011894 is an apocalyptic number.

8219011894 is a deficient number, since it is larger than the sum of its proper divisors (4109505950).

8219011894 is a wasteful number, since it uses less digits than its factorization.

8219011894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4109505949.

The product of its (nonzero) digits is 41472, while the sum is 43.

The square root of 8219011894 is about 90658.7662280929. The cubic root of 8219011894 is about 2018.0869295805.

The spelling of 8219011894 in words is "eight billion, two hundred nineteen million, eleven thousand, eight hundred ninety-four".