81116562 has 16 divisors (see below), whose sum is σ = 163268352. Its totient is φ = 26866320.

The previous prime is 81116557. The next prime is 81116587. The reversal of 81116562 is 26561118.

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, 42114 + ... + 43997.

It is an arithmetic number, because the mean of its divisors is an integer number (10204272).

Almost surely, 2^81116562 is an apocalyptic number.

81116562 is an abundant number, since it is smaller than the sum of its proper divisors (82151790).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81116562 is a wasteful number, since it uses less digits than its factorization.

81116562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86273.

The product of its digits is 2880, while the sum is 30.

The square root of 81116562 is about 9006.4733386604. The cubic root of 81116562 is about 432.8823166716.

The spelling of 81116562 in words is "eighty-one million, one hundred sixteen thousand, five hundred sixty-two".