81316150 has 24 divisors (see below), whose sum is σ = 151646544. Its totient is φ = 32440800.

The previous prime is 81316133. The next prime is 81316159. The reversal of 81316150 is 5161318.

It is a super-2 number, since 2×81316150² = 13224632501645000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81316159) 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 11 ways as a sum of consecutive naturals, for example, 19119 + ... + 22981.

It is an arithmetic number, because the mean of its divisors is an integer number (6318606).

Almost surely, 2^81316150 is an apocalyptic number.

81316150 is a deficient number, since it is larger than the sum of its proper divisors (70330394).

81316150 is a wasteful number, since it uses less digits than its factorization.

81316150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4296 (or 4291 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 81316150 is about 9017.5467839097. The cubic root of 81316150 is about 433.2370627690.

Adding to 81316150 its reverse (5161318), we get a palindrome (86477468).

The spelling of 81316150 in words is "eighty-one million, three hundred sixteen thousand, one hundred fifty".