8782172291 has 2 divisors, whose sum is σ = 8782172292. Its totient is φ = 8782172290.

The previous prime is 8782172237. The next prime is 8782172297. The reversal of 8782172291 is 1922712878.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8782172291 - 2⁶ = 8782172227 is a prime.

It is not a weakly prime, because it can be changed into another prime (8782172297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4391086145 + 4391086146.

It is an arithmetic number, because the mean of its divisors is an integer number (4391086146).

Almost surely, 2^8782172291 is an apocalyptic number.

8782172291 is a deficient number, since it is larger than the sum of its proper divisors (1).

8782172291 is an equidigital number, since it uses as much as digits as its factorization.

8782172291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 47.

The square root of 8782172291 is about 93713.2450137119. The cubic root of 8782172291 is about 2063.1651073493.

The spelling of 8782172291 in words is "eight billion, seven hundred eighty-two million, one hundred seventy-two thousand, two hundred ninety-one".