81061582 has 24 divisors (see below), whose sum is σ = 142265160. Its totient is φ = 34539120.

The previous prime is 81061553. The next prime is 81061681. The reversal of 81061582 is 28516018.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15232 + ... + 19852.

It is an arithmetic number, because the mean of its divisors is an integer number (5927715).

Almost surely, 2^81061582 is an apocalyptic number.

81061582 is a deficient number, since it is larger than the sum of its proper divisors (61203578).

81061582 is a wasteful number, since it uses less digits than its factorization.

81061582 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4816 (or 4809 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 81061582 is about 9003.4205722048. The cubic root of 81061582 is about 432.7844934555.

The spelling of 81061582 in words is "eighty-one million, sixty-one thousand, five hundred eighty-two".