84791581 has 4 divisors (see below), whose sum is σ = 96904672. Its totient is φ = 72678492.

The previous prime is 84791561. The next prime is 84791587. The reversal of 84791581 is 18519748.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 84791581 - 2⁵ = 84791549 is a prime.

It is a super-2 number, since 2×84791581² = 14379224416959122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84791587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6056535 + ... + 6056548.

It is an arithmetic number, because the mean of its divisors is an integer number (24226168).

Almost surely, 2^84791581 is an apocalyptic number.

It is an amenable number.

84791581 is a deficient number, since it is larger than the sum of its proper divisors (12113091).

84791581 is a wasteful number, since it uses less digits than its factorization.

84791581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12113090.

The product of its digits is 80640, while the sum is 43.

The square root of 84791581 is about 9208.2344127417. The cubic root of 84791581 is about 439.3233072738.

The spelling of 84791581 in words is "eighty-four million, seven hundred ninety-one thousand, five hundred eighty-one".