84865811 has 4 divisors (see below), whose sum is σ = 84884352. Its totient is φ = 84847272.

The previous prime is 84865783. The next prime is 84865813. The reversal of 84865811 is 11856848.

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 84865811 - 2⁶ = 84865747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84865813) 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, 3086 + ... + 13388.

It is an arithmetic number, because the mean of its divisors is an integer number (21221088).

Almost surely, 2^84865811 is an apocalyptic number.

84865811 is a deficient number, since it is larger than the sum of its proper divisors (18541).

84865811 is a wasteful number, since it uses less digits than its factorization.

84865811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18540.

The product of its digits is 61440, while the sum is 41.

The square root of 84865811 is about 9212.2641625173. The cubic root of 84865811 is about 439.4514703808.

The spelling of 84865811 in words is "eighty-four million, eight hundred sixty-five thousand, eight hundred eleven".