99609999 has 8 divisors (see below), whose sum is σ = 132859440. Its totient is φ = 66383616.

The previous prime is 99609943. The next prime is 99610001. The reversal of 99609999 is 99990699.

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

It is not a de Polignac number, because 99609999 - 2⁷ = 99609871 is a prime.

99609999 is a modest number, since divided by 9999 gives 9960 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99609929) 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, 14079 + ... + 19935.

It is an arithmetic number, because the mean of its divisors is an integer number (16607430).

Almost surely, 2^99609999 is an apocalyptic number.

99609999 is a deficient number, since it is larger than the sum of its proper divisors (33249441).

99609999 is a wasteful number, since it uses less digits than its factorization.

99609999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11529.

The product of its (nonzero) digits is 3188646, while the sum is 60.

The square root of 99609999 is about 9980.4809002372. The cubic root of 99609999 is about 463.5546891291.

The spelling of 99609999 in words is "ninety-nine million, six hundred nine thousand, nine hundred ninety-nine".