81410565 has 8 divisors (see below), whose sum is σ = 130256928. Its totient is φ = 43418960.

The previous prime is 81410531. The next prime is 81410587. The reversal of 81410565 is 56501418.

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

It is not a de Polignac number, because 81410565 - 2¹⁰ = 81409541 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2713671 + ... + 2713700.

It is an arithmetic number, because the mean of its divisors is an integer number (16282116).

Almost surely, 2^81410565 is an apocalyptic number.

It is an amenable number.

81410565 is a deficient number, since it is larger than the sum of its proper divisors (48846363).

81410565 is a wasteful number, since it uses less digits than its factorization.

81410565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5427379.

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 81410565 is about 9022.7803364595. The cubic root of 81410565 is about 433.4046730016.

The spelling of 81410565 in words is "eighty-one million, four hundred ten thousand, five hundred sixty-five".