81265115 has 16 divisors (see below), whose sum is σ = 101243520. Its totient is φ = 62574720.

The previous prime is 81265091. The next prime is 81265123. The reversal of 81265115 is 51156218.

It is not a de Polignac number, because 81265115 - 2²² = 77070811 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11501 + ... + 17169.

It is an arithmetic number, because the mean of its divisors is an integer number (6327720).

Almost surely, 2^81265115 is an apocalyptic number.

81265115 is a deficient number, since it is larger than the sum of its proper divisors (19978405).

81265115 is a wasteful number, since it uses less digits than its factorization.

81265115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5782.

The product of its digits is 2400, while the sum is 29.

The square root of 81265115 is about 9014.7165790168. The cubic root of 81265115 is about 433.1464088597.

The spelling of 81265115 in words is "eighty-one million, two hundred sixty-five thousand, one hundred fifteen".