84661081 has 4 divisors (see below), whose sum is σ = 84680100. Its totient is φ = 84642064.

The previous prime is 84661051. The next prime is 84661097. The reversal of 84661081 is 18016648.

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 19713600 + 64947481 = 4440^2 + 8059^2 .

It is a cyclic number.

It is not a de Polignac number, because 84661081 - 2¹³ = 84652889 is a prime.

It is a super-2 number, since 2×84661081² = 14334997272177122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84661021) 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, 1155 + ... + 13063.

It is an arithmetic number, because the mean of its divisors is an integer number (21170025).

Almost surely, 2^84661081 is an apocalyptic number.

It is an amenable number.

84661081 is a deficient number, since it is larger than the sum of its proper divisors (19019).

84661081 is a wasteful number, since it uses less digits than its factorization.

84661081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19018.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 84661081 is about 9201.1456351913. The cubic root of 84661081 is about 439.0978087493.

The spelling of 84661081 in words is "eighty-four million, six hundred sixty-one thousand, eighty-one".