84091971 has 4 divisors (see below), whose sum is σ = 112122632. Its totient is φ = 56061312.

The previous prime is 84091963. The next prime is 84091991. The reversal of 84091971 is 17919048.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 84091971 - 2³ = 84091963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84091991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14015326 + ... + 14015331.

It is an arithmetic number, because the mean of its divisors is an integer number (28030658).

Almost surely, 2^84091971 is an apocalyptic number.

84091971 is a deficient number, since it is larger than the sum of its proper divisors (28030661).

84091971 is a wasteful number, since it uses less digits than its factorization.

84091971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28030660.

The product of its (nonzero) digits is 18144, while the sum is 39.

The square root of 84091971 is about 9170.1674466718. The cubic root of 84091971 is about 438.1116924970. Note that the first 3 decimals are identical.

The spelling of 84091971 in words is "eighty-four million, ninety-one thousand, nine hundred seventy-one".