84859661 has 4 divisors (see below), whose sum is σ = 85638300. Its totient is φ = 84081024.

The previous prime is 84859657. The next prime is 84859693. The reversal of 84859661 is 16695848.

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 33292900 + 51566761 = 5770^2 + 7181^2 .

It is a cyclic number.

It is not a de Polignac number, because 84859661 - 2² = 84859657 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 (84859561) 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, 389156 + ... + 389373.

It is an arithmetic number, because the mean of its divisors is an integer number (21409575).

Almost surely, 2^84859661 is an apocalyptic number.

It is an amenable number.

84859661 is a deficient number, since it is larger than the sum of its proper divisors (778639).

84859661 is a wasteful number, since it uses less digits than its factorization.

84859661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778638.

The product of its digits is 414720, while the sum is 47.

The square root of 84859661 is about 9211.9303623073. The cubic root of 84859661 is about 439.4408548306.

The spelling of 84859661 in words is "eighty-four million, eight hundred fifty-nine thousand, six hundred sixty-one".