81065545 has 8 divisors (see below), whose sum is σ = 106122240. Its totient is φ = 58956720.

The previous prime is 81065539. The next prime is 81065549. The reversal of 81065545 is 54556018.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81065545 - 2⁵ = 81065513 is a prime.

It is a super-2 number, since 2×81065545² = 13143245172294050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81065545.

It is not an unprimeable number, because it can be changed into a prime (81065549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 736905 + ... + 737014.

It is an arithmetic number, because the mean of its divisors is an integer number (13265280).

Almost surely, 2^81065545 is an apocalyptic number.

It is an amenable number.

81065545 is a deficient number, since it is larger than the sum of its proper divisors (25056695).

81065545 is a wasteful number, since it uses less digits than its factorization.

81065545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473935.

The product of its (nonzero) digits is 24000, while the sum is 34.

The square root of 81065545 is about 9003.6406525361. The cubic root of 81065545 is about 432.7915461060.

The spelling of 81065545 in words is "eighty-one million, sixty-five thousand, five hundred forty-five".