9219661081 has 2 divisors, whose sum is σ = 9219661082. Its totient is φ = 9219661080.

The previous prime is 9219661043. The next prime is 9219661093. The reversal of 9219661081 is 1801669129.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5578745481 + 3640915600 = 74691^2 + 60340^2 .

It is a cyclic number.

It is not a de Polignac number, because 9219661081 - 2¹⁷ = 9219530009 is a prime.

It is a super-2 number, since 2×9219661081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9219661001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4609830540 + 4609830541.

It is an arithmetic number, because the mean of its divisors is an integer number (4609830541).

Almost surely, 2^9219661081 is an apocalyptic number.

It is an amenable number.

9219661081 is a deficient number, since it is larger than the sum of its proper divisors (1).

9219661081 is an equidigital number, since it uses as much as digits as its factorization.

9219661081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 43.

The square root of 9219661081 is about 96019.0662368678. The cubic root of 9219661081 is about 2096.8707043802.

The spelling of 9219661081 in words is "nine billion, two hundred nineteen million, six hundred sixty-one thousand, eighty-one".