84591691 has 4 divisors (see below), whose sum is σ = 85610952. Its totient is φ = 83572432.

The previous prime is 84591673. The next prime is 84591697. The reversal of 84591691 is 19619548.

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

It is a cyclic number.

It is not a de Polignac number, because 84591691 - 2⁹ = 84591179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84591697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 509506 + ... + 509671.

It is an arithmetic number, because the mean of its divisors is an integer number (21402738).

Almost surely, 2^84591691 is an apocalyptic number.

84591691 is a deficient number, since it is larger than the sum of its proper divisors (1019261).

84591691 is a wasteful number, since it uses less digits than its factorization.

84591691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1019260.

The product of its digits is 77760, while the sum is 43.

The square root of 84591691 is about 9197.3741361326. The cubic root of 84591691 is about 438.9778113639.

The spelling of 84591691 in words is "eighty-four million, five hundred ninety-one thousand, six hundred ninety-one".