98999981 has 4 divisors (see below), whose sum is σ = 103304352. Its totient is φ = 94695612.

The previous prime is 98999977. The next prime is 98999983. The reversal of 98999981 is 18999989.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 98999981 - 2² = 98999977 is a prime.

It is a super-2 number, since 2×98999981² = 19601992476000722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (98999983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2152151 + ... + 2152196.

It is an arithmetic number, because the mean of its divisors is an integer number (25826088).

Almost surely, 2^98999981 is an apocalyptic number.

It is an amenable number.

98999981 is a deficient number, since it is larger than the sum of its proper divisors (4304371).

98999981 is a wasteful number, since it uses less digits than its factorization.

98999981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4304370.

The product of its digits is 3779136, while the sum is 62.

The square root of 98999981 is about 9949.8734162802. The cubic root of 98999981 is about 462.6064713239.

The spelling of 98999981 in words is "ninety-eight million, nine hundred ninety-nine thousand, nine hundred eighty-one".