71641739 has 4 divisors (see below), whose sum is σ = 77152656. Its totient is φ = 66130824.

The previous prime is 71641729. The next prime is 71641747. The reversal of 71641739 is 93714617.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71641739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71641709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2755439 + ... + 2755464.

It is an arithmetic number, because the mean of its divisors is an integer number (19288164).

Almost surely, 2^71641739 is an apocalyptic number.

71641739 is a deficient number, since it is larger than the sum of its proper divisors (5510917).

71641739 is a wasteful number, since it uses less digits than its factorization.

71641739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5510916.

The product of its digits is 31752, while the sum is 38.

The square root of 71641739 is about 8464.1443158774. The cubic root of 71641739 is about 415.3256050173.

The spelling of 71641739 in words is "seventy-one million, six hundred forty-one thousand, seven hundred thirty-nine".