991100100010 has 16 divisors (see below), whose sum is σ = 1784160540072. Its totient is φ = 396399960000.

The previous prime is 991100099989. The next prime is 991100100017. The reversal of 991100100010 is 10001001199.

It can be written as a sum of positive squares in 4 ways, for example, as 869767007769 + 121333092241 = 932613^2 + 348329^2 .

It is not an unprimeable number, because it can be changed into a prime (991100100017) 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, 4906041 + ... + 5104060.

Almost surely, 2^991100100010 is an apocalyptic number.

991100100010 is a deficient number, since it is larger than the sum of its proper divisors (793060440062).

991100100010 is a wasteful number, since it uses less digits than its factorization.

991100100010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10020009.

The product of its (nonzero) digits is 81, while the sum is 22.

It can be divided in two parts, 991 and 100100010, that added together give a palindrome (100101001).

The spelling of 991100100010 in words is "nine hundred ninety-one billion, one hundred million, one hundred thousand, ten".