81595982 has 16 divisors (see below), whose sum is σ = 133092960. Its totient is φ = 37292832.

The previous prime is 81595963. The next prime is 81595993. The reversal of 81595982 is 28959518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12557 + ... + 17912.

It is an arithmetic number, because the mean of its divisors is an integer number (8318310).

Almost surely, 2^81595982 is an apocalyptic number.

81595982 is a deficient number, since it is larger than the sum of its proper divisors (51496978).

81595982 is a wasteful number, since it uses less digits than its factorization.

81595982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30587.

The product of its digits is 259200, while the sum is 47.

The square root of 81595982 is about 9033.0494297330. The cubic root of 81595982 is about 433.7334577762.

It can be divided in two parts, 8159 and 5982, that added together give a palindrome (14141).

The spelling of 81595982 in words is "eighty-one million, five hundred ninety-five thousand, nine hundred eighty-two".