8641528991 has 2 divisors, whose sum is σ = 8641528992. Its totient is φ = 8641528990.

The previous prime is 8641528979. The next prime is 8641528999. The reversal of 8641528991 is 1998251468.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8641528991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8641528999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4320764495 + 4320764496.

It is an arithmetic number, because the mean of its divisors is an integer number (4320764496).

Almost surely, 2^8641528991 is an apocalyptic number.

8641528991 is a deficient number, since it is larger than the sum of its proper divisors (1).

8641528991 is an equidigital number, since it uses as much as digits as its factorization.

8641528991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 53.

The square root of 8641528991 is about 92959.8246071925. The cubic root of 8641528991 is about 2052.0921722907.

The spelling of 8641528991 in words is "eight billion, six hundred forty-one million, five hundred twenty-eight thousand, nine hundred ninety-one".