84509691 has 16 divisors (see below), whose sum is σ = 130543104. Its totient is φ = 47628864.

The previous prime is 84509681. The next prime is 84509693. The reversal of 84509691 is 19690548.

It is not a de Polignac number, because 84509691 - 2¹⁵ = 84476923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84509693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26031 + ... + 29096.

It is an arithmetic number, because the mean of its divisors is an integer number (8158944).

Almost surely, 2^84509691 is an apocalyptic number.

84509691 is a deficient number, since it is larger than the sum of its proper divisors (46033413).

84509691 is a wasteful number, since it uses less digits than its factorization.

84509691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55210.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 84509691 is about 9192.9152612215. The cubic root of 84509691 is about 438.8359226532.

The spelling of 84509691 in words is "eighty-four million, five hundred nine thousand, six hundred ninety-one".