81268315 has 16 divisors (see below), whose sum is σ = 102187008. Its totient is φ = 61928416.

The previous prime is 81268309. The next prime is 81268321. The reversal of 81268315 is 51386218.

It is an interprime number because it is at equal distance from previous prime (81268309) and next prime (81268321).

It is a cyclic number.

It is not a de Polignac number, because 81268315 - 2¹¹ = 81266267 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 28902 + ... + 31588.

It is an arithmetic number, because the mean of its divisors is an integer number (6386688).

Almost surely, 2^81268315 is an apocalyptic number.

81268315 is a deficient number, since it is larger than the sum of its proper divisors (20918693).

81268315 is a wasteful number, since it uses less digits than its factorization.

81268315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2978.

The product of its digits is 11520, while the sum is 34.

The square root of 81268315 is about 9014.8940648241. The cubic root of 81268315 is about 433.1520941623.

The spelling of 81268315 in words is "eighty-one million, two hundred sixty-eight thousand, three hundred fifteen".