99985521 has 8 divisors (see below), whose sum is σ = 133441024. Its totient is φ = 66593520.

The previous prime is 99985489. The next prime is 99985547. The reversal of 99985521 is 12558999.

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 99985521 - 2⁵ = 99985489 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99985021) 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, 12070 + ... + 18591.

It is an arithmetic number, because the mean of its divisors is an integer number (16680128).

Almost surely, 2^99985521 is an apocalyptic number.

It is an amenable number.

99985521 is a deficient number, since it is larger than the sum of its proper divisors (33455503).

99985521 is a wasteful number, since it uses less digits than its factorization.

99985521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31751.

The product of its digits is 291600, while the sum is 48.

The square root of 99985521 is about 9999.2760237929. The cubic root of 99985521 is about 464.1364804251.

It can be divided in two parts, 99 and 985521, that multiplied together give a palindrome (97566579).

The spelling of 99985521 in words is "ninety-nine million, nine hundred eighty-five thousand, five hundred twenty-one".