99891611 has 4 divisors (see below), whose sum is σ = 100232832. Its totient is φ = 99550392.

The previous prime is 99891593. The next prime is 99891637. The reversal of 99891611 is 11619899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11619899 = 23 ⋅505213.

It is a cyclic number.

It is not a de Polignac number, because 99891611 - 2¹⁴ = 99875227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99891511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170171 + ... + 170756.

It is an arithmetic number, because the mean of its divisors is an integer number (25058208).

Almost surely, 2^99891611 is an apocalyptic number.

99891611 is a deficient number, since it is larger than the sum of its proper divisors (341221).

99891611 is a wasteful number, since it uses less digits than its factorization.

99891611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341220.

The product of its digits is 34992, while the sum is 44.

The square root of 99891611 is about 9994.5790806817. The cubic root of 99891611 is about 463.9911236783.

The spelling of 99891611 in words is "ninety-nine million, eight hundred ninety-one thousand, six hundred eleven".