91010220201 has 12 divisors (see below), whose sum is σ = 132219089028. Its totient is φ = 60322765344.

The previous prime is 91010220193. The next prime is 91010220209. The reversal of 91010220201 is 10202201019.

It is an interprime number because it is at equal distance from previous prime (91010220193) and next prime (91010220209).

It can be written as a sum of positive squares in 2 ways, for example, as 65933914176 + 25076306025 = 256776^2 + 158355^2 .

It is not a de Polignac number, because 91010220201 - 2³ = 91010220193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91010220209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29224590 + ... + 29227703.

It is an arithmetic number, because the mean of its divisors is an integer number (11018257419).

Almost surely, 2^91010220201 is an apocalyptic number.

It is an amenable number.

91010220201 is a deficient number, since it is larger than the sum of its proper divisors (41208868827).

91010220201 is a wasteful number, since it uses less digits than its factorization.

91010220201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58452472 (or 58452469 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The spelling of 91010220201 in words is "ninety-one billion, ten million, two hundred twenty thousand, two hundred one".