100110991 has 2 divisors, whose sum is σ = 100110992. Its totient is φ = 100110990.

The previous prime is 100110961. The next prime is 100111001. The reversal of 100110991 is 199011001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 100110991 - 2¹³ = 100102799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100110911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50055495 + 50055496.

It is an arithmetic number, because the mean of its divisors is an integer number (50055496).

Almost surely, 2^100110991 is an apocalyptic number.

100110991 is a deficient number, since it is larger than the sum of its proper divisors (1).

100110991 is an equidigital number, since it uses as much as digits as its factorization.

100110991 is an odious number, because the sum of its binary digits is odd.

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

The square root of 100110991 is about 10005.5480109787. The cubic root of 100110991 is about 464.3305447295.

Adding to 100110991 its reverse (199011001), we get a palindrome (299121992).

It can be divided in two parts, 100110 and 991, that added together give a palindrome (101101).

The spelling of 100110991 in words is "one hundred million, one hundred ten thousand, nine hundred ninety-one".