99911609 has 8 divisors (see below), whose sum is σ = 119149440. Its totient is φ = 81914976.

The previous prime is 99911599. The next prime is 99911621. The reversal of 99911609 is 90611999.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 99911609 - 2⁸ = 99911353 is a prime.

It is a super-2 number, since 2×99911609² = 19964659225937762, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99911609.

It is not an unprimeable number, because it can be changed into a prime (99911639) 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, 310124 + ... + 310445.

It is an arithmetic number, because the mean of its divisors is an integer number (14893680).

Almost surely, 2^99911609 is an apocalyptic number.

It is an amenable number.

99911609 is a deficient number, since it is larger than the sum of its proper divisors (19237831).

99911609 is a wasteful number, since it uses less digits than its factorization.

99911609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620599.

The product of its (nonzero) digits is 39366, while the sum is 44.

The square root of 99911609 is about 9995.5794729470. The cubic root of 99911609 is about 464.0220848213.

The spelling of 99911609 in words is "ninety-nine million, nine hundred eleven thousand, six hundred nine".