8725581 has 6 divisors (see below), whose sum is σ = 12603630. Its totient is φ = 5817048.

The previous prime is 8725571. The next prime is 8725609. The reversal of 8725581 is 1855278.

8725581 is a `hidden beast` number, since 8 + 72 + 5 + 581 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6502500 + 2223081 = 2550^2 + 1491^2 .

It is not a de Polignac number, because 8725581 - 2¹³ = 8717389 is a prime.

It is a super-2 number, since 2×8725581² = 152271527575122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8725511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 484746 + ... + 484763.

It is an arithmetic number, because the mean of its divisors is an integer number (2100605).

Almost surely, 2^8725581 is an apocalyptic number.

It is an amenable number.

8725581 is a deficient number, since it is larger than the sum of its proper divisors (3878049).

8725581 is a wasteful number, since it uses less digits than its factorization.

8725581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969515 (or 969512 counting only the distinct ones).

The product of its digits is 22400, while the sum is 36.

The square root of 8725581 is about 2953.9094434326. The cubic root of 8725581 is about 205.8723956017.

The spelling of 8725581 in words is "eight million, seven hundred twenty-five thousand, five hundred eighty-one".