84911591 has 4 divisors (see below), whose sum is σ = 84933312. Its totient is φ = 84889872.

The previous prime is 84911587. The next prime is 84911599. The reversal of 84911591 is 19511948.

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 84911591 - 2² = 84911587 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84911599) 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, 3191 + ... + 13416.

It is an arithmetic number, because the mean of its divisors is an integer number (21233328).

Almost surely, 2^84911591 is an apocalyptic number.

84911591 is a deficient number, since it is larger than the sum of its proper divisors (21721).

84911591 is a wasteful number, since it uses less digits than its factorization.

84911591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21720.

The product of its digits is 12960, while the sum is 38.

The square root of 84911591 is about 9214.7485586965. The cubic root of 84911591 is about 439.5304753875.

The spelling of 84911591 in words is "eighty-four million, nine hundred eleven thousand, five hundred ninety-one".