84487581 has 6 divisors (see below), whose sum is σ = 122037630. Its totient is φ = 56325048.

The previous prime is 84487567. The next prime is 84487583. The reversal of 84487581 is 18578448.

It can be written as a sum of positive squares in only one way, i.e., 82192356 + 2295225 = 9066^2 + 1515^2 .

It is not a de Polignac number, because 84487581 - 2⁶ = 84487517 is a prime.

It is a super-2 number, since 2×84487581² = 14276302686463122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84487583) 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 5 ways as a sum of consecutive naturals, for example, 4693746 + ... + 4693763.

It is an arithmetic number, because the mean of its divisors is an integer number (20339605).

Almost surely, 2^84487581 is an apocalyptic number.

It is an amenable number.

84487581 is a deficient number, since it is larger than the sum of its proper divisors (37550049).

84487581 is a wasteful number, since it uses less digits than its factorization.

84487581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9387515 (or 9387512 counting only the distinct ones).

The product of its digits is 286720, while the sum is 45.

The square root of 84487581 is about 9191.7126260561. The cubic root of 84487581 is about 438.7976489026.

The spelling of 84487581 in words is "eighty-four million, four hundred eighty-seven thousand, five hundred eighty-one".