8219639149 has 4 divisors (see below), whose sum is σ = 8233048636. Its totient is φ = 8206229664.

The previous prime is 8219639107. The next prime is 8219639161. The reversal of 8219639149 is 9419369128.

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 562164100 + 7657475049 = 23710^2 + 87507^2 .

It is a cyclic number.

It is not a de Polignac number, because 8219639149 - 2³¹ = 6072155501 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8219639096 and 8219639105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8219639849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6703824 + ... + 6705049.

It is an arithmetic number, because the mean of its divisors is an integer number (2058262159).

Almost surely, 2^8219639149 is an apocalyptic number.

It is an amenable number.

8219639149 is a deficient number, since it is larger than the sum of its proper divisors (13409487).

8219639149 is a wasteful number, since it uses less digits than its factorization.

8219639149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13409486.

The product of its digits is 839808, while the sum is 52.

The square root of 8219639149 is about 90662.2255903747. The cubic root of 8219639149 is about 2018.1382667701.

The spelling of 8219639149 in words is "eight billion, two hundred nineteen million, six hundred thirty-nine thousand, one hundred forty-nine".