8215772141 has 4 divisors (see below), whose sum is σ = 8215986300. Its totient is φ = 8215557984.

The previous prime is 8215772107. The next prime is 8215772143. The reversal of 8215772141 is 1412775128.

8215772141 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 7495923241 + 719848900 = 86579^2 + 26830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8215772141 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8215772095 and 8215772104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8215772143) 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, 31976 + ... + 132113.

It is an arithmetic number, because the mean of its divisors is an integer number (2053996575).

Almost surely, 2^8215772141 is an apocalyptic number.

It is an amenable number.

8215772141 is a deficient number, since it is larger than the sum of its proper divisors (214159).

8215772141 is a wasteful number, since it uses less digits than its factorization.

8215772141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214158.

The product of its digits is 31360, while the sum is 38.

The square root of 8215772141 is about 90640.8966250886. The cubic root of 8215772141 is about 2017.8217329642.

The spelling of 8215772141 in words is "eight billion, two hundred fifteen million, seven hundred seventy-two thousand, one hundred forty-one".