991630101 has 24 divisors (see below), whose sum is σ = 1677862944. Its totient is φ = 515131680.

The previous prime is 991630069. The next prime is 991630117. The reversal of 991630101 is 101036199.

991630101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 991630101 - 2⁵ = 991630069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991670101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 305010 + ... + 308243.

It is an arithmetic number, because the mean of its divisors is an integer number (69910956).

Almost surely, 2^991630101 is an apocalyptic number.

It is an amenable number.

991630101 is a deficient number, since it is larger than the sum of its proper divisors (686232843).

991630101 is a wasteful number, since it uses less digits than its factorization.

991630101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613281 (or 613274 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 991630101 is about 31490.1587960429. The cubic root of 991630101 is about 997.2022133566.

The spelling of 991630101 in words is "nine hundred ninety-one million, six hundred thirty thousand, one hundred one".