81366315 has 16 divisors (see below), whose sum is σ = 134676000. Its totient is φ = 41898752.

The previous prime is 81366283. The next prime is 81366317. The reversal of 81366315 is 51366318.

It is a cyclic number.

It is not a de Polignac number, because 81366315 - 2⁵ = 81366283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81366317) 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, 93090 + ... + 93959.

It is an arithmetic number, because the mean of its divisors is an integer number (8417250).

Almost surely, 2^81366315 is an apocalyptic number.

81366315 is a deficient number, since it is larger than the sum of its proper divisors (53309685).

81366315 is a wasteful number, since it uses less digits than its factorization.

81366315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187086.

The product of its digits is 12960, while the sum is 33.

The square root of 81366315 is about 9020.3278765242. The cubic root of 81366315 is about 433.3261343314.

The spelling of 81366315 in words is "eighty-one million, three hundred sixty-six thousand, three hundred fifteen".