71344513 has 4 divisors (see below), whose sum is σ = 71369428. Its totient is φ = 71319600.

The previous prime is 71344501. The next prime is 71344523. The reversal of 71344513 is 31544317.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31544317 = 7 ⋅4506331.

It can be written as a sum of positive squares in 2 ways, for example, as 51022449 + 20322064 = 7143^2 + 4508^2 .

It is a cyclic number.

It is not a de Polignac number, because 71344513 - 2⁹ = 71344001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71344523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7506 + ... + 14107.

It is an arithmetic number, because the mean of its divisors is an integer number (17842357).

Almost surely, 2^71344513 is an apocalyptic number.

It is an amenable number.

71344513 is a deficient number, since it is larger than the sum of its proper divisors (24915).

71344513 is a wasteful number, since it uses less digits than its factorization.

71344513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24914.

The product of its digits is 5040, while the sum is 28.

The square root of 71344513 is about 8446.5681196566. The cubic root of 71344513 is about 414.7504436618.

The spelling of 71344513 in words is "seventy-one million, three hundred forty-four thousand, five hundred thirteen".