84691691 has 16 divisors (see below), whose sum is σ = 99610560. Its totient is φ = 70494720.

The previous prime is 84691669. The next prime is 84691699. The reversal of 84691691 is 19619648.

It is a cyclic number.

It is not a de Polignac number, because 84691691 - 2⁶ = 84691627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84691699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76655 + ... + 77751.

It is an arithmetic number, because the mean of its divisors is an integer number (6225660).

Almost surely, 2^84691691 is an apocalyptic number.

84691691 is a deficient number, since it is larger than the sum of its proper divisors (14918869).

84691691 is a wasteful number, since it uses less digits than its factorization.

84691691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414.

The product of its digits is 93312, while the sum is 44.

The square root of 84691691 is about 9202.8088646891. The cubic root of 84691691 is about 439.1507223361.

The spelling of 84691691 in words is "eighty-four million, six hundred ninety-one thousand, six hundred ninety-one".