81232265 has 4 divisors (see below), whose sum is σ = 97478724. Its totient is φ = 64985808.

The previous prime is 81232247. The next prime is 81232331. The reversal of 81232265 is 56223218.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36929929 + 44302336 = 6077^2 + 6656^2 .

It is a cyclic number.

It is not a de Polignac number, because 81232265 - 2¹⁴ = 81215881 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8123222 + ... + 8123231.

It is an arithmetic number, because the mean of its divisors is an integer number (24369681).

Almost surely, 2^81232265 is an apocalyptic number.

It is an amenable number.

81232265 is a deficient number, since it is larger than the sum of its proper divisors (16246459).

81232265 is a wasteful number, since it uses less digits than its factorization.

81232265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16246458.

The product of its digits is 5760, while the sum is 29.

The square root of 81232265 is about 9012.8943741730. The cubic root of 81232265 is about 433.0880370429.

The spelling of 81232265 in words is "eighty-one million, two hundred thirty-two thousand, two hundred sixty-five".