99981147 has 8 divisors (see below), whose sum is σ = 152352256. Its totient is φ = 57132072.

The previous prime is 99981073. The next prime is 99981163. The reversal of 99981147 is 74118999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99981147 - 2¹⁰ = 99980123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 99981096 and 99981105.

It is not an unprimeable number, because it can be changed into a prime (99981047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2380483 + ... + 2380524.

It is an arithmetic number, because the mean of its divisors is an integer number (19044032).

Almost surely, 2^99981147 is an apocalyptic number.

99981147 is a deficient number, since it is larger than the sum of its proper divisors (52371109).

99981147 is a wasteful number, since it uses less digits than its factorization.

99981147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4761017.

The product of its digits is 163296, while the sum is 48.

The square root of 99981147 is about 9999.0573055664. The cubic root of 99981147 is about 464.1297122366.

It can be divided in two parts, 99981 and 147, that added together give a triangular number (100128 = T₄₄₇).

The spelling of 99981147 in words is "ninety-nine million, nine hundred eighty-one thousand, one hundred forty-seven".