99599961 has 8 divisors (see below), whose sum is σ = 134481280. Its totient is φ = 65559312.

The previous prime is 99599953. The next prime is 99599963. The reversal of 99599961 is 16999599.

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

It is not a de Polignac number, because 99599961 - 2³ = 99599953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99599963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209890 + ... + 210363.

It is an arithmetic number, because the mean of its divisors is an integer number (16810160).

Almost surely, 2^99599961 is an apocalyptic number.

It is an amenable number.

99599961 is a deficient number, since it is larger than the sum of its proper divisors (34881319).

99599961 is a wasteful number, since it uses less digits than its factorization.

99599961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420335.

The product of its digits is 1771470, while the sum is 57.

The square root of 99599961 is about 9979.9780059878. The cubic root of 99599961 is about 463.5391173381.

It can be divided in two parts, 99 and 599961, that added together give a triangular number (600060 = T₁₀₉₅).

The spelling of 99599961 in words is "ninety-nine million, five hundred ninety-nine thousand, nine hundred sixty-one".