991190101 has 16 divisors (see below), whose sum is σ = 1119888000. Its totient is φ = 868996800.

The previous prime is 991190087. The next prime is 991190143. The reversal of 991190101 is 101091199.

991190101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 991190101 - 2⁵ = 991190069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991160101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 445171 + ... + 447391.

It is an arithmetic number, because the mean of its divisors is an integer number (69993000).

Almost surely, 2^991190101 is an apocalyptic number.

It is an amenable number.

991190101 is a deficient number, since it is larger than the sum of its proper divisors (128697899).

991190101 is a wasteful number, since it uses less digits than its factorization.

991190101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3660.

The product of its (nonzero) digits is 729, while the sum is 31.

The square root of 991190101 is about 31483.1717112492. The cubic root of 991190101 is about 997.0547007288.

The spelling of 991190101 in words is "nine hundred ninety-one million, one hundred ninety thousand, one hundred one".