8708640091 has 2 divisors, whose sum is σ = 8708640092. Its totient is φ = 8708640090.

The previous prime is 8708640041. The next prime is 8708640103. The reversal of 8708640091 is 1900468078.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8708640091 is a prime.

It is not a weakly prime, because it can be changed into another prime (8708640041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4354320045 + 4354320046.

It is an arithmetic number, because the mean of its divisors is an integer number (4354320046).

Almost surely, 2^8708640091 is an apocalyptic number.

8708640091 is a deficient number, since it is larger than the sum of its proper divisors (1).

8708640091 is an equidigital number, since it uses as much as digits as its factorization.

8708640091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 8708640091 is about 93320.0947867071. The cubic root of 8708640091 is about 2057.3907400837.

The spelling of 8708640091 in words is "eight billion, seven hundred eight million, six hundred forty thousand, ninety-one".