81583465 has 8 divisors (see below), whose sum is σ = 98055360. Its totient is φ = 65163312.

The previous prime is 81583451. The next prime is 81583477. The reversal of 81583465 is 56438518.

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

It is a cyclic number.

It is not a de Polignac number, because 81583465 - 2¹¹ = 81581417 is a prime.

It is a super-2 number, since 2×81583465² = 13311723522812450, which contains 22 as substring.

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, 9375 + ... + 15844.

It is an arithmetic number, because the mean of its divisors is an integer number (12256920).

Almost surely, 2^81583465 is an apocalyptic number.

It is an amenable number.

81583465 is a deficient number, since it is larger than the sum of its proper divisors (16471895).

81583465 is a wasteful number, since it uses less digits than its factorization.

81583465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25871.

The product of its digits is 115200, while the sum is 40.

The square root of 81583465 is about 9032.3565585068. The cubic root of 81583465 is about 433.7112780920.

The spelling of 81583465 in words is "eighty-one million, five hundred eighty-three thousand, four hundred sixty-five".