991910120101 has 8 divisors (see below), whose sum is σ = 1013803192800. Its totient is φ = 970198733040.

The previous prime is 991910120083. The next prime is 991910120147. The reversal of 991910120101 is 101021019199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 991910120101 - 2¹⁷ = 991909989029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991910120161) 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, 45410371 + ... + 45432208.

It is an arithmetic number, because the mean of its divisors is an integer number (126725399100).

Almost surely, 2^991910120101 is an apocalyptic number.

It is an amenable number.

991910120101 is a deficient number, since it is larger than the sum of its proper divisors (21893072699).

991910120101 is a wasteful number, since it uses less digits than its factorization.

991910120101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90842819.

The product of its (nonzero) digits is 1458, while the sum is 34.

The spelling of 991910120101 in words is "nine hundred ninety-one billion, nine hundred ten million, one hundred twenty thousand, one hundred one".