81316914 has 32 divisors (see below), whose sum is σ = 193950720. Its totient is φ = 22222992.

The previous prime is 81316889. The next prime is 81316919. The reversal of 81316914 is 41961318.

It is a super-2 number, since 2×81316914² = 13224881004966792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81316919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41124 + ... + 43055.

It is an arithmetic number, because the mean of its divisors is an integer number (6060960).

Almost surely, 2^81316914 is an apocalyptic number.

81316914 is an abundant number, since it is smaller than the sum of its proper divisors (112633806).

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

81316914 is a wasteful number, since it uses less digits than its factorization.

81316914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84214.

The product of its digits is 5184, while the sum is 33.

The square root of 81316914 is about 9017.5891456642. The cubic root of 81316914 is about 433.2384195806.

The spelling of 81316914 in words is "eighty-one million, three hundred sixteen thousand, nine hundred fourteen".