99885981 has 8 divisors (see below), whose sum is σ = 143426080. Its totient is φ = 61468272.

The previous prime is 99885979. The next prime is 99886009. The reversal of 99885981 is 18958899.

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

It is not a de Polignac number, because 99885981 - 2¹ = 99885979 is a prime.

It is a super-2 number, since 2×99885981² = 19954418400664722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99885581) 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, 1280551 + ... + 1280628.

It is an arithmetic number, because the mean of its divisors is an integer number (17928260).

Almost surely, 2^99885981 is an apocalyptic number.

It is an amenable number.

99885981 is a deficient number, since it is larger than the sum of its proper divisors (43540099).

99885981 is a wasteful number, since it uses less digits than its factorization.

99885981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2561195.

The product of its digits is 1866240, while the sum is 57.

The square root of 99885981 is about 9994.2974240314. The cubic root of 99885981 is about 463.9824064995.

The spelling of 99885981 in words is "ninety-nine million, eight hundred eighty-five thousand, nine hundred eighty-one".