8901812081 has 2 divisors, whose sum is σ = 8901812082. Its totient is φ = 8901812080.

The previous prime is 8901812041. The next prime is 8901812219. The reversal of 8901812081 is 1802181098.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5631001600 + 3270810481 = 75040^2 + 57191^2 .

It is a cyclic number.

It is not a de Polignac number, because 8901812081 - 2²⁶ = 8834703217 is a prime.

It is a super-2 number, since 2×8901812081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8901812041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4450906040 + 4450906041.

It is an arithmetic number, because the mean of its divisors is an integer number (4450906041).

Almost surely, 2^8901812081 is an apocalyptic number.

It is an amenable number.

8901812081 is a deficient number, since it is larger than the sum of its proper divisors (1).

8901812081 is an equidigital number, since it uses as much as digits as its factorization.

8901812081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 38.

The square root of 8901812081 is about 94349.4148418526. The cubic root of 8901812081 is about 2072.4917352583.

The spelling of 8901812081 in words is "eight billion, nine hundred one million, eight hundred twelve thousand, eighty-one".