81316262 has 16 divisors (see below), whose sum is σ = 123863040. Its totient is φ = 40032072.

The previous prime is 81316231. The next prime is 81316267. The reversal of 81316262 is 26261318.

It is a super-2 number, since 2×81316262² = 13224668931305288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81316267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62939 + ... + 64217.

It is an arithmetic number, because the mean of its divisors is an integer number (7741440).

Almost surely, 2^81316262 is an apocalyptic number.

81316262 is a deficient number, since it is larger than the sum of its proper divisors (42546778).

81316262 is a wasteful number, since it uses less digits than its factorization.

81316262 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1747.

The product of its digits is 3456, while the sum is 29.

The square root of 81316262 is about 9017.5529940223. The cubic root of 81316262 is about 433.2372616738.

The spelling of 81316262 in words is "eighty-one million, three hundred sixteen thousand, two hundred sixty-two".