991099010 has 16 divisors (see below), whose sum is σ = 1946158272. Its totient is φ = 360399600.

The previous prime is 991099009. The next prime is 991099019. The reversal of 991099010 is 10990199.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (991099019) 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, 4504886 + ... + 4505105.

It is an arithmetic number, because the mean of its divisors is an integer number (121634892).

Almost surely, 2^991099010 is an apocalyptic number.

991099010 is a deficient number, since it is larger than the sum of its proper divisors (955059262).

991099010 is a wasteful number, since it uses less digits than its factorization.

991099010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9010009.

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

The square root of 991099010 is about 31481.7250162694. The cubic root of 991099010 is about 997.0241564730.

It can be divided in two parts, 9 and 91099010, that added together give a palindrome (91099019).

The spelling of 991099010 in words is "nine hundred ninety-one million, ninety-nine thousand, ten".