81316275 has 12 divisors (see below), whose sum is σ = 134443032. Its totient is φ = 43368640.

The previous prime is 81316273. The next prime is 81316283. The reversal of 81316275 is 57261318.

It is not a de Polignac number, because 81316275 - 2¹ = 81316273 is a prime.

It is a super-2 number, since 2×81316275² = 13224673159751250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81316271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 542034 + ... + 542183.

It is an arithmetic number, because the mean of its divisors is an integer number (11203586).

Almost surely, 2^81316275 is an apocalyptic number.

81316275 is a deficient number, since it is larger than the sum of its proper divisors (53126757).

81316275 is a wasteful number, since it uses less digits than its factorization.

81316275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1084230 (or 1084225 counting only the distinct ones).

The product of its digits is 10080, while the sum is 33.

The square root of 81316275 is about 9017.5537148386. The cubic root of 81316275 is about 433.2372847610.

The spelling of 81316275 in words is "eighty-one million, three hundred sixteen thousand, two hundred seventy-five".