99992081 has 8 divisors (see below), whose sum is σ = 117963264. Its totient is φ = 82942560.

The previous prime is 99992059. The next prime is 99992089. The reversal of 99992081 is 18029999.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99992081 is a prime.

It is a super-2 number, since 2×99992081² = 19996832525421122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (99992089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230180 + ... + 230613.

It is an arithmetic number, because the mean of its divisors is an integer number (14745408).

Almost surely, 2^99992081 is an apocalyptic number.

It is an amenable number.

99992081 is a deficient number, since it is larger than the sum of its proper divisors (17971183).

99992081 is a wasteful number, since it uses less digits than its factorization.

99992081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460831.

The product of its (nonzero) digits is 104976, while the sum is 47.

The square root of 99992081 is about 9999.6040421609. The cubic root of 99992081 is about 464.1466307905.

It can be divided in two parts, 999920 and 81, that added together give a palindrome (1000001).

The spelling of 99992081 in words is "ninety-nine million, nine hundred ninety-two thousand, eighty-one".