84405271 has 2 divisors, whose sum is σ = 84405272. Its totient is φ = 84405270.

The previous prime is 84405263. The next prime is 84405311. The reversal of 84405271 is 17250448.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84405271 - 2³ = 84405263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84405071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42202635 + 42202636.

It is an arithmetic number, because the mean of its divisors is an integer number (42202636).

Almost surely, 2^84405271 is an apocalyptic number.

84405271 is a deficient number, since it is larger than the sum of its proper divisors (1).

84405271 is an equidigital number, since it uses as much as digits as its factorization.

84405271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 84405271 is about 9187.2341322076. The cubic root of 84405271 is about 438.6551065736.

The spelling of 84405271 in words is "eighty-four million, four hundred five thousand, two hundred seventy-one".