91181021201 has 8 divisors (see below), whose sum is σ = 91392542400. Its totient is φ = 90969600528.

The previous prime is 91181021161. The next prime is 91181021207. The reversal of 91181021201 is 10212018119.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91181021201 is a prime.

It is a super-2 number, since 2×91181021201² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91181021207) 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, 1973375 + ... + 2019051.

It is an arithmetic number, because the mean of its divisors is an integer number (11424067800).

Almost surely, 2^91181021201 is an apocalyptic number.

It is an amenable number.

91181021201 is a deficient number, since it is larger than the sum of its proper divisors (211521199).

91181021201 is a wasteful number, since it uses less digits than its factorization.

91181021201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50263.

The product of its (nonzero) digits is 288, while the sum is 26.

The spelling of 91181021201 in words is "ninety-one billion, one hundred eighty-one million, twenty-one thousand, two hundred one".