81089582 has 16 divisors (see below), whose sum is σ = 145055232. Its totient is φ = 33241560.

The previous prime is 81089579. The next prime is 81089611. The reversal of 81089582 is 28598018.

It is a super-3 number, since 3×81089582³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 125594 + ... + 126237.

It is an arithmetic number, because the mean of its divisors is an integer number (9065952).

Almost surely, 2^81089582 is an apocalyptic number.

81089582 is a deficient number, since it is larger than the sum of its proper divisors (63965650).

81089582 is a wasteful number, since it uses less digits than its factorization.

81089582 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251863.

The product of its (nonzero) digits is 46080, while the sum is 41.

The square root of 81089582 is about 9004.9754025205. The cubic root of 81089582 is about 432.8343180068.

The spelling of 81089582 in words is "eighty-one million, eighty-nine thousand, five hundred eighty-two".