9221795901081 has 81 divisors (see below), whose sum is σ = 13821733555357. Its totient is φ = 5924803160640.

The previous prime is 9221795901067. The next prime is 9221795901121. The reversal of 9221795901081 is 1801095971229.

It is a happy number.

The square root of 9221795901081 is 3036741.

It is a perfect power (a square), and thus also a powerful number.

9221795901081 is a `hidden beast` number, since 9 + 22 + 17 + 9 + 590 + 10 + 8 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 790810025625 + 8430985875456 = 889275^2 + 2903616^2 .

It is not a de Polignac number, because 9221795901081 - 2⁵ = 9221795901049 is a prime.

It is a super-2 number, since 2×9221795901081² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9221795901281) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 34281769015 + ... + 34281769283.

Almost surely, 2^{9221795901081} is an apocalyptic number.

9221795901081 is the 3036741-st square number.

9221795901081 is the 1518371-st centered octagonal number.

It is an amenable number.

9221795901081 is a deficient number, since it is larger than the sum of its proper divisors (4599937654276).

9221795901081 is an frugal number, since it uses more digits than its factorization.

9221795901081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792 (or 396 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 54.

The spelling of 9221795901081 in words is "nine trillion, two hundred twenty-one billion, seven hundred ninety-five million, nine hundred one thousand, eighty-one".