91101020201 has 2 divisors, whose sum is σ = 91101020202. Its totient is φ = 91101020200.

The previous prime is 91101020191. The next prime is 91101020233. The reversal of 91101020201 is 10202010119.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84422208025 + 6678812176 = 290555^2 + 81724^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91101020201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91101020201.

It is not a weakly prime, because it can be changed into another prime (91101020281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45550510100 + 45550510101.

It is an arithmetic number, because the mean of its divisors is an integer number (45550510101).

Almost surely, 2^91101020201 is an apocalyptic number.

It is an amenable number.

91101020201 is a deficient number, since it is larger than the sum of its proper divisors (1).

91101020201 is an equidigital number, since it uses as much as digits as its factorization.

91101020201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 91101020201 in words is "ninety-one billion, one hundred one million, twenty thousand, two hundred one".