84351661 has 2 divisors, whose sum is σ = 84351662. Its totient is φ = 84351660.

The previous prime is 84351653. The next prime is 84351679. The reversal of 84351661 is 16615348.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81090025 + 3261636 = 9005^2 + 1806^2 .

It is a cyclic number.

It is not a de Polignac number, because 84351661 - 2³ = 84351653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84351361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42175830 + 42175831.

It is an arithmetic number, because the mean of its divisors is an integer number (42175831).

Almost surely, 2^84351661 is an apocalyptic number.

It is an amenable number.

84351661 is a deficient number, since it is larger than the sum of its proper divisors (1).

84351661 is an equidigital number, since it uses as much as digits as its factorization.

84351661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 34.

The square root of 84351661 is about 9184.3160333255. The cubic root of 84351661 is about 438.5622163211.

The spelling of 84351661 in words is "eighty-four million, three hundred fifty-one thousand, six hundred sixty-one".