8215391215 has 8 divisors (see below), whose sum is σ = 9877322448. Its totient is φ = 6559744320.

The previous prime is 8215391167. The next prime is 8215391257. The reversal of 8215391215 is 5121935128.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8215391215 - 2²³ = 8207002607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1568206 + ... + 1573435.

It is an arithmetic number, because the mean of its divisors is an integer number (1234665306).

Almost surely, 2^8215391215 is an apocalyptic number.

8215391215 is a deficient number, since it is larger than the sum of its proper divisors (1661931233).

8215391215 is a wasteful number, since it uses less digits than its factorization.

8215391215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3142169.

The product of its digits is 21600, while the sum is 37.

The square root of 8215391215 is about 90638.7953086315. The cubic root of 8215391215 is about 2017.7905469061.

The spelling of 8215391215 in words is "eight billion, two hundred fifteen million, three hundred ninety-one thousand, two hundred fifteen".