98679809 has 2 divisors, whose sum is σ = 98679810. Its totient is φ = 98679808.

The previous prime is 98679803. The next prime is 98679827. The reversal of 98679809 is 90897689.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84125584 + 14554225 = 9172^2 + 3815^2 .

It is a cyclic number.

It is not a de Polignac number, because 98679809 - 2¹² = 98675713 is a prime.

It is not a weakly prime, because it can be changed into another prime (98679803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49339904 + 49339905.

It is an arithmetic number, because the mean of its divisors is an integer number (49339905).

Almost surely, 2^98679809 is an apocalyptic number.

It is an amenable number.

98679809 is a deficient number, since it is larger than the sum of its proper divisors (1).

98679809 is an equidigital number, since it uses as much as digits as its factorization.

98679809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 56.

The square root of 98679809 is about 9933.7711368845. The cubic root of 98679809 is about 462.1072335306.

The spelling of 98679809 in words is "ninety-eight million, six hundred seventy-nine thousand, eight hundred nine".