84291971 has 4 divisors (see below), whose sum is σ = 84346032. Its totient is φ = 84237912.

The previous prime is 84291953. The next prime is 84291979. The reversal of 84291971 is 17919248.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84291971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84291979) 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, 24620 + ... + 27833.

It is an arithmetic number, because the mean of its divisors is an integer number (21086508).

Almost surely, 2^84291971 is an apocalyptic number.

84291971 is a deficient number, since it is larger than the sum of its proper divisors (54061).

84291971 is a wasteful number, since it uses less digits than its factorization.

84291971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54060.

The product of its digits is 36288, while the sum is 41.

The square root of 84291971 is about 9181.0658967246. The cubic root of 84291971 is about 438.4587449112.

The spelling of 84291971 in words is "eighty-four million, two hundred ninety-one thousand, nine hundred seventy-one".