99400091 has 16 divisors (see below), whose sum is σ = 115814400. Its totient is φ = 83554848.

The previous prime is 99400087. The next prime is 99400117. The reversal of 99400091 is 19000499.

It is not a de Polignac number, because 99400091 - 2² = 99400087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99400051) 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 15 ways as a sum of consecutive naturals, for example, 95150 + ... + 96188.

It is an arithmetic number, because the mean of its divisors is an integer number (7238400).

Almost surely, 2^99400091 is an apocalyptic number.

99400091 is a deficient number, since it is larger than the sum of its proper divisors (16414309).

99400091 is a wasteful number, since it uses less digits than its factorization.

99400091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 99400091 is about 9969.9594282023. The cubic root of 99400091 is about 463.2288441062.

The spelling of 99400091 in words is "ninety-nine million, four hundred thousand, ninety-one".