98181891 has 6 divisors (see below), whose sum is σ = 141818300. Its totient is φ = 65454588.

The previous prime is 98181883. The next prime is 98181893. The reversal of 98181891 is 19818189.

It is not a de Polignac number, because 98181891 - 2³ = 98181883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (98181893) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5454541 + ... + 5454558.

Almost surely, 2^98181891 is an apocalyptic number.

98181891 is a deficient number, since it is larger than the sum of its proper divisors (43636409).

98181891 is a wasteful number, since it uses less digits than its factorization.

98181891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10909105 (or 10909102 counting only the distinct ones).

The product of its digits is 41472, while the sum is 45.

The square root of 98181891 is about 9908.6775606031. The cubic root of 98181891 is about 461.3286899478.

The spelling of 98181891 in words is "ninety-eight million, one hundred eighty-one thousand, eight hundred ninety-one".