84621581 has 8 divisors (see below), whose sum is σ = 94566528. Its totient is φ = 75052000.

The previous prime is 84621569. The next prime is 84621583. The reversal of 84621581 is 18512648.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 84621581 - 2¹⁴ = 84605197 is a prime.

It is a super-2 number, since 2×84621581² = 14321623941879122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84621583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93365 + ... + 94266.

It is an arithmetic number, because the mean of its divisors is an integer number (11820816).

Almost surely, 2^84621581 is an apocalyptic number.

It is an amenable number.

84621581 is a deficient number, since it is larger than the sum of its proper divisors (9944947).

84621581 is a wasteful number, since it uses less digits than its factorization.

84621581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187683.

The product of its digits is 15360, while the sum is 35.

The square root of 84621581 is about 9198.9989129253. The cubic root of 84621581 is about 439.0295087254.

The spelling of 84621581 in words is "eighty-four million, six hundred twenty-one thousand, five hundred eighty-one".