8140661 has 2 divisors, whose sum is σ = 8140662. Its totient is φ = 8140660.

The previous prime is 8140651. The next prime is 8140663. The reversal of 8140661 is 1660418.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6400900 + 1739761 = 2530^2 + 1319^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8140661 is a prime.

Together with 8140663, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8140661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8140663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4070330 + 4070331.

It is an arithmetic number, because the mean of its divisors is an integer number (4070331).

Almost surely, 2^8140661 is an apocalyptic number.

It is an amenable number.

8140661 is a deficient number, since it is larger than the sum of its proper divisors (1).

8140661 is an equidigital number, since it uses as much as digits as its factorization.

8140661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 8140661 is about 2853.1843613759. The cubic root of 8140661 is about 201.1653713590.

The spelling of 8140661 in words is "eight million, one hundred forty thousand, six hundred sixty-one".