98191809 has 6 divisors (see below), whose sum is σ = 141832626. Its totient is φ = 65461200.

The previous prime is 98191771. The next prime is 98191817. The reversal of 98191809 is 90819189.

It can be written as a sum of positive squares in only one way, i.e., 55577025 + 42614784 = 7455^2 + 6528^2 .

It is not a de Polignac number, because 98191809 - 2⁸ = 98191553 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (98191109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5455092 + ... + 5455109.

It is an arithmetic number, because the mean of its divisors is an integer number (23638771).

Almost surely, 2^98191809 is an apocalyptic number.

It is an amenable number.

98191809 is a deficient number, since it is larger than the sum of its proper divisors (43640817).

98191809 is a wasteful number, since it uses less digits than its factorization.

98191809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10910207 (or 10910204 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 45.

The square root of 98191809 is about 9909.1780183828. The cubic root of 98191809 is about 461.3442233754.

It can be divided in two parts, 9819180 and 9, that added together give a palindrome (9819189).

The spelling of 98191809 in words is "ninety-eight million, one hundred ninety-one thousand, eight hundred nine".