91120101001 has 2 divisors, whose sum is σ = 91120101002. Its totient is φ = 91120101000.

The previous prime is 91120100999. The next prime is 91120101019. The reversal of 91120101001 is 10010102119.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59134566976 + 31985534025 = 243176^2 + 178845^2 .

It is an emirp because it is prime and its reverse (10010102119) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91120101001 - 2¹ = 91120100999 is a prime.

Together with 91120100999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (91120101071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45560050500 + 45560050501.

It is an arithmetic number, because the mean of its divisors is an integer number (45560050501).

Almost surely, 2^91120101001 is an apocalyptic number.

It is an amenable number.

91120101001 is a deficient number, since it is larger than the sum of its proper divisors (1).

91120101001 is an equidigital number, since it uses as much as digits as its factorization.

91120101001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18, while the sum is 16.

The spelling of 91120101001 in words is "ninety-one billion, one hundred twenty million, one hundred one thousand, one".