84815641 has 2 divisors, whose sum is σ = 84815642. Its totient is φ = 84815640.

The previous prime is 84815629. The next prime is 84815671. The reversal of 84815641 is 14651848.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77951241 + 6864400 = 8829^2 + 2620^2 .

It is a cyclic number.

It is not a de Polignac number, because 84815641 - 2¹⁷ = 84684569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84815641.

It is not a weakly prime, because it can be changed into another prime (84815611) 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, 42407820 + 42407821.

It is an arithmetic number, because the mean of its divisors is an integer number (42407821).

Almost surely, 2^84815641 is an apocalyptic number.

It is an amenable number.

84815641 is a deficient number, since it is larger than the sum of its proper divisors (1).

84815641 is an equidigital number, since it uses as much as digits as its factorization.

84815641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30720, while the sum is 37.

The square root of 84815641 is about 9209.5407594516. The cubic root of 84815641 is about 439.3648566786.

The spelling of 84815641 in words is "eighty-four million, eight hundred fifteen thousand, six hundred forty-one".