84569813 has 4 divisors (see below), whose sum is σ = 84821100. Its totient is φ = 84318528.

The previous prime is 84569809. The next prime is 84569819. The reversal of 84569813 is 31896548.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20857489 + 63712324 = 4567^2 + 7982^2 .

It is a cyclic number.

It is not a de Polignac number, because 84569813 - 2² = 84569809 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 (84569819) 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, 125138 + ... + 125811.

It is an arithmetic number, because the mean of its divisors is an integer number (21205275).

Almost surely, 2^84569813 is an apocalyptic number.

It is an amenable number.

84569813 is a deficient number, since it is larger than the sum of its proper divisors (251287).

84569813 is a wasteful number, since it uses less digits than its factorization.

84569813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251286.

The product of its digits is 207360, while the sum is 44.

The square root of 84569813 is about 9196.1846980147. The cubic root of 84569813 is about 438.9399637356.

The spelling of 84569813 in words is "eighty-four million, five hundred sixty-nine thousand, eight hundred thirteen".