84171491 has 2 divisors, whose sum is σ = 84171492. Its totient is φ = 84171490.

The previous prime is 84171457. The next prime is 84171523. The reversal of 84171491 is 19417148.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84171491 - 2¹⁸ = 83909347 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84170491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42085745 + 42085746.

It is an arithmetic number, because the mean of its divisors is an integer number (42085746).

Almost surely, 2^84171491 is an apocalyptic number.

84171491 is a deficient number, since it is larger than the sum of its proper divisors (1).

84171491 is an equidigital number, since it uses as much as digits as its factorization.

84171491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 35.

The square root of 84171491 is about 9174.5022208292. The cubic root of 84171491 is about 438.2497463668.

The spelling of 84171491 in words is "eighty-four million, one hundred seventy-one thousand, four hundred ninety-one".