8188406081 has 2 divisors, whose sum is σ = 8188406082. Its totient is φ = 8188406080.

The previous prime is 8188406077. The next prime is 8188406113. The reversal of 8188406081 is 1806048818.

It is a happy number.

8188406081 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8103600400 + 84805681 = 90020^2 + 9209^2 .

It is a cyclic number.

It is not a de Polignac number, because 8188406081 - 2² = 8188406077 is a prime.

It is a super-2 number, since 2×8188406081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8188406381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4094203040 + 4094203041.

It is an arithmetic number, because the mean of its divisors is an integer number (4094203041).

Almost surely, 2^8188406081 is an apocalyptic number.

It is an amenable number.

8188406081 is a deficient number, since it is larger than the sum of its proper divisors (1).

8188406081 is an equidigital number, since it uses as much as digits as its factorization.

8188406081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98304, while the sum is 44.

The square root of 8188406081 is about 90489.8120287582. The cubic root of 8188406081 is about 2015.5788415160.

The spelling of 8188406081 in words is "eight billion, one hundred eighty-eight million, four hundred six thousand, eighty-one".