99533681 has 4 divisors (see below), whose sum is σ = 107190132. Its totient is φ = 91877232.

The previous prime is 99533641. The next prime is 99533689. The reversal of 99533681 is 18633599.

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 49350625 + 50183056 = 7025^2 + 7084^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99533681 is a prime.

It is a super-2 number, since 2×99533681² = 19813907306819522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99533689) 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, 3828206 + ... + 3828231.

It is an arithmetic number, because the mean of its divisors is an integer number (26797533).

Almost surely, 2^99533681 is an apocalyptic number.

It is an amenable number.

99533681 is a deficient number, since it is larger than the sum of its proper divisors (7656451).

99533681 is a wasteful number, since it uses less digits than its factorization.

99533681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7656450.

The product of its digits is 174960, while the sum is 44.

The square root of 99533681 is about 9976.6568047618. The cubic root of 99533681 is about 463.4362719487.

The spelling of 99533681 in words is "ninety-nine million, five hundred thirty-three thousand, six hundred eighty-one".