99509281 has 8 divisors (see below), whose sum is σ = 101251584. Its totient is φ = 97780080.

The previous prime is 99509257. The next prime is 99509297. The reversal of 99509281 is 18290599.

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

It is a cyclic number.

It is not a de Polignac number, because 99509281 - 2¹³ = 99501089 is a prime.

It is a super-2 number, since 2×99509281² = 19804194010273922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99509581) 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, 12715 + ... + 18991.

It is an arithmetic number, because the mean of its divisors is an integer number (12656448).

Almost surely, 2^99509281 is an apocalyptic number.

It is an amenable number.

99509281 is a deficient number, since it is larger than the sum of its proper divisors (1742303).

99509281 is a wasteful number, since it uses less digits than its factorization.

99509281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6551.

The product of its (nonzero) digits is 58320, while the sum is 43.

The square root of 99509281 is about 9975.4338752758. The cubic root of 99509281 is about 463.3983994448.

The spelling of 99509281 in words is "ninety-nine million, five hundred nine thousand, two hundred eighty-one".