99967521 has 8 divisors (see below), whose sum is σ = 134664544. Its totient is φ = 65957760.

The previous prime is 99967519. The next prime is 99967537. The reversal of 99967521 is 12576999.

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

It is not a de Polignac number, because 99967521 - 2¹ = 99967519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99967501) 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, 171475 + ... + 172056.

It is an arithmetic number, because the mean of its divisors is an integer number (16833068).

Almost surely, 2^99967521 is an apocalyptic number.

It is an amenable number.

99967521 is a deficient number, since it is larger than the sum of its proper divisors (34697023).

99967521 is a wasteful number, since it uses less digits than its factorization.

99967521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343631.

The product of its digits is 306180, while the sum is 48.

The square root of 99967521 is about 9998.3759181179. The cubic root of 99967521 is about 464.1086265320.

The spelling of 99967521 in words is "ninety-nine million, nine hundred sixty-seven thousand, five hundred twenty-one".