98109989 has 2 divisors, whose sum is σ = 98109990. Its totient is φ = 98109988.

The previous prime is 98109983. The next prime is 98109997. The reversal of 98109989 is 98990189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96628900 + 1481089 = 9830^2 + 1217^2 .

It is an emirp because it is prime and its reverse (98990189) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 98109989 - 2⁸ = 98109733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 98109989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (98109983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49054994 + 49054995.

It is an arithmetic number, because the mean of its divisors is an integer number (49054995).

Almost surely, 2^98109989 is an apocalyptic number.

It is an amenable number.

98109989 is a deficient number, since it is larger than the sum of its proper divisors (1).

98109989 is an equidigital number, since it uses as much as digits as its factorization.

98109989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 419904, while the sum is 53.

The square root of 98109989 is about 9905.0486621722. The cubic root of 98109989 is about 461.2160467855.

The spelling of 98109989 in words is "ninety-eight million, one hundred nine thousand, nine hundred eighty-nine".