84915661 has 2 divisors, whose sum is σ = 84915662. Its totient is φ = 84915660.

The previous prime is 84915637. The next prime is 84915667. The reversal of 84915661 is 16651948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79762761 + 5152900 = 8931^2 + 2270^2 .

It is a cyclic number.

It is not a de Polignac number, because 84915661 - 2¹¹ = 84913613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84915667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42457830 + 42457831.

It is an arithmetic number, because the mean of its divisors is an integer number (42457831).

Almost surely, 2^84915661 is an apocalyptic number.

It is an amenable number.

84915661 is a deficient number, since it is larger than the sum of its proper divisors (1).

84915661 is an equidigital number, since it uses as much as digits as its factorization.

84915661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 40.

The square root of 84915661 is about 9214.9693976703. The cubic root of 84915661 is about 439.5374978306.

The spelling of 84915661 in words is "eighty-four million, nine hundred fifteen thousand, six hundred sixty-one".