99991533 has 8 divisors (see below), whose sum is σ = 133379008. Its totient is φ = 66632544.

The previous prime is 99991519. The next prime is 99991559. The reversal of 99991533 is 33519999.

It is a happy number.

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

It is not a de Polignac number, because 99991533 - 2⁴ = 99991517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99991583) 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, 3216 + ... + 14502.

It is an arithmetic number, because the mean of its divisors is an integer number (16672376).

Almost surely, 2^99991533 is an apocalyptic number.

It is an amenable number.

99991533 is a deficient number, since it is larger than the sum of its proper divisors (33387475).

99991533 is a wasteful number, since it uses less digits than its factorization.

99991533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14243.

The product of its digits is 295245, while the sum is 48.

The square root of 99991533 is about 9999.5766410384. The cubic root of 99991533 is about 464.1457828806.

The spelling of 99991533 in words is "ninety-nine million, nine hundred ninety-one thousand, five hundred thirty-three".