84475861 has 2 divisors, whose sum is σ = 84475862. Its totient is φ = 84475860.

The previous prime is 84475801. The next prime is 84475879. The reversal of 84475861 is 16857448.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72573361 + 11902500 = 8519^2 + 3450^2 .

It is a cyclic number.

It is not a de Polignac number, because 84475861 - 2⁷ = 84475733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84475801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42237930 + 42237931.

It is an arithmetic number, because the mean of its divisors is an integer number (42237931).

Almost surely, 2^84475861 is an apocalyptic number.

It is an amenable number.

84475861 is a deficient number, since it is larger than the sum of its proper divisors (1).

84475861 is an equidigital number, since it uses as much as digits as its factorization.

84475861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 215040, while the sum is 43.

The square root of 84475861 is about 9191.0750731348. The cubic root of 84475861 is about 438.7773581640. Note that the first 3 decimals are identical.

The spelling of 84475861 in words is "eighty-four million, four hundred seventy-five thousand, eight hundred sixty-one".