99831661 has 16 divisors (see below), whose sum is σ = 108520704. Its totient is φ = 91580544.

The previous prime is 99831581. The next prime is 99831703. The reversal of 99831661 is 16613899.

It is not a de Polignac number, because 99831661 - 2¹³ = 99823469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99831161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61320 + ... + 62926.

It is an arithmetic number, because the mean of its divisors is an integer number (6782544).

Almost surely, 2^99831661 is an apocalyptic number.

It is an amenable number.

99831661 is a deficient number, since it is larger than the sum of its proper divisors (8689043).

99831661 is a wasteful number, since it uses less digits than its factorization.

99831661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1740.

The product of its digits is 69984, while the sum is 43.

The square root of 99831661 is about 9991.5795047630. The cubic root of 99831661 is about 463.8982836020.

The spelling of 99831661 in words is "ninety-nine million, eight hundred thirty-one thousand, six hundred sixty-one".