98564891 has 2 divisors, whose sum is σ = 98564892. Its totient is φ = 98564890.

The previous prime is 98564887. The next prime is 98564909. The reversal of 98564891 is 19846589.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 98564891 - 2² = 98564887 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (98564831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49282445 + 49282446.

It is an arithmetic number, because the mean of its divisors is an integer number (49282446).

Almost surely, 2^98564891 is an apocalyptic number.

98564891 is a deficient number, since it is larger than the sum of its proper divisors (1).

98564891 is an equidigital number, since it uses as much as digits as its factorization.

98564891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 50.

The square root of 98564891 is about 9927.9852437441. The cubic root of 98564891 is about 461.9277808567.

The spelling of 98564891 in words is "ninety-eight million, five hundred sixty-four thousand, eight hundred ninety-one".