71709613 has 4 divisors (see below), whose sum is σ = 72085248. Its totient is φ = 71333980.

The previous prime is 71709611. The next prime is 71709619. The reversal of 71709613 is 31690717.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71709613 - 2¹ = 71709611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71709611) by changing a digit.

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, 187531 + ... + 187912.

It is an arithmetic number, because the mean of its divisors is an integer number (18021312).

Almost surely, 2^71709613 is an apocalyptic number.

It is an amenable number.

71709613 is a deficient number, since it is larger than the sum of its proper divisors (375635).

71709613 is a wasteful number, since it uses less digits than its factorization.

71709613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375634.

The product of its (nonzero) digits is 7938, while the sum is 34.

The square root of 71709613 is about 8468.1528682470. The cubic root of 71709613 is about 415.4567246354.

The spelling of 71709613 in words is "seventy-one million, seven hundred nine thousand, six hundred thirteen".