81031016 has 16 divisors (see below), whose sum is σ = 165745440. Its totient is φ = 36832240.

The previous prime is 81031007. The next prime is 81031021. The reversal of 81031016 is 61013018.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 460316 + ... + 460491.

It is an arithmetic number, because the mean of its divisors is an integer number (10359090).

Almost surely, 2^81031016 is an apocalyptic number.

It is an amenable number.

81031016 is an abundant number, since it is smaller than the sum of its proper divisors (84714424).

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

81031016 is a wasteful number, since it uses less digits than its factorization.

81031016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920824 (or 920820 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 81031016 is about 9001.7229461920. The cubic root of 81031016 is about 432.7300897395.

It can be divided in two parts, 8103 and 1016, that added together give a palindrome (9119).

The spelling of 81031016 in words is "eighty-one million, thirty-one thousand, sixteen".