8181697 has 2 divisors, whose sum is σ = 8181698. Its totient is φ = 8181696.

The previous prime is 8181637. The next prime is 8181727. The reversal of 8181697 is 7961818.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4165681 + 4016016 = 2041^2 + 2004^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8181697 is a prime.

8181697 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (8181617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4090848 + 4090849.

It is an arithmetic number, because the mean of its divisors is an integer number (4090849).

Almost surely, 2^8181697 is an apocalyptic number.

It is an amenable number.

8181697 is a deficient number, since it is larger than the sum of its proper divisors (1).

8181697 is an equidigital number, since it uses as much as digits as its factorization.

8181697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 40.

The square root of 8181697 is about 2860.3665848978. The cubic root of 8181697 is about 201.5028210275.

The spelling of 8181697 in words is "eight million, one hundred eighty-one thousand, six hundred ninety-seven".