99910081 has 4 divisors (see below), whose sum is σ = 99956164. Its totient is φ = 99864000.

The previous prime is 99910079. The next prime is 99910087. The reversal of 99910081 is 18001999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57138481 + 42771600 = 7559^2 + 6540^2 .

It is a cyclic number.

It is not a de Polignac number, because 99910081 - 2¹ = 99910079 is a prime.

It is a super-2 number, since 2×99910081² = 19964048570853122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99910081.

It is not an unprimeable number, because it can be changed into a prime (99910087) 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, 19620 + ... + 24181.

It is an arithmetic number, because the mean of its divisors is an integer number (24989041).

Almost surely, 2^99910081 is an apocalyptic number.

It is an amenable number.

99910081 is a deficient number, since it is larger than the sum of its proper divisors (46083).

99910081 is a wasteful number, since it uses less digits than its factorization.

99910081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46082.

The product of its (nonzero) digits is 5832, while the sum is 37.

The square root of 99910081 is about 9995.5030388670. The cubic root of 99910081 is about 464.0197192992.

The spelling of 99910081 in words is "ninety-nine million, nine hundred ten thousand, eighty-one".