71481565 has 4 divisors (see below), whose sum is σ = 85777884. Its totient is φ = 57185248.

The previous prime is 71481551. The next prime is 71481581. The reversal of 71481565 is 56518417.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56518417 = 79 ⋅715423.

It can be written as a sum of positive squares in 2 ways, for example, as 26604964 + 44876601 = 5158^2 + 6699^2 .

It is a cyclic number.

It is not a de Polignac number, because 71481565 - 2⁵ = 71481533 is a prime.

It is a super-2 number, since 2×71481565² = 10219228269698450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7148152 + ... + 7148161.

It is an arithmetic number, because the mean of its divisors is an integer number (21444471).

Almost surely, 2^71481565 is an apocalyptic number.

It is an amenable number.

71481565 is a deficient number, since it is larger than the sum of its proper divisors (14296319).

71481565 is a wasteful number, since it uses less digits than its factorization.

71481565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14296318.

The product of its digits is 33600, while the sum is 37.

The square root of 71481565 is about 8454.6771079681. The cubic root of 71481565 is about 415.0158507518.

It can be divided in two parts, 71 and 481565, that added together give a square (481636 = 694²).

The spelling of 71481565 in words is "seventy-one million, four hundred eighty-one thousand, five hundred sixty-five".