98909891 has 4 divisors (see below), whose sum is σ = 98929800. Its totient is φ = 98889984.

The previous prime is 98909879. The next prime is 98909897. The reversal of 98909891 is 19890989.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19890989 = 1301 ⋅15289.

It is a cyclic number.

It is not a de Polignac number, because 98909891 - 2⁶ = 98909827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (98909897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4355 + ... + 14723.

It is an arithmetic number, because the mean of its divisors is an integer number (24732450).

Almost surely, 2^98909891 is an apocalyptic number.

98909891 is a deficient number, since it is larger than the sum of its proper divisors (19909).

98909891 is a wasteful number, since it uses less digits than its factorization.

98909891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19908.

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

The square root of 98909891 is about 9945.3451926014. The cubic root of 98909891 is about 462.4661047475.

The spelling of 98909891 in words is "ninety-eight million, nine hundred nine thousand, eight hundred ninety-one".