99991010 has 32 divisors (see below), whose sum is σ = 207747072. Its totient is φ = 33940800.

The previous prime is 99991009. The next prime is 99991033. The reversal of 99991010 is 1019999.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2 + ... + 14141.

It is an arithmetic number, because the mean of its divisors is an integer number (6492096).

Almost surely, 2^99991010 is an apocalyptic number.

99991010 is an abundant number, since it is smaller than the sum of its proper divisors (107756062).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99991010 is a wasteful number, since it uses less digits than its factorization.

99991010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14258.

The product of its (nonzero) digits is 6561, while the sum is 38.

The square root of 99991010 is about 9999.5504898970. The cubic root of 99991010 is about 464.1449736499.

The spelling of 99991010 in words is "ninety-nine million, nine hundred ninety-one thousand, ten".