71709421 has 8 divisors (see below), whose sum is σ = 82007424. Its totient is φ = 61424880.

The previous prime is 71709419. The next prime is 71709437. The reversal of 71709421 is 12490717.

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 71709421 - 2¹ = 71709419 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 (71704421) 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 7 ways as a sum of consecutive naturals, for example, 14136 + ... + 18526.

It is an arithmetic number, because the mean of its divisors is an integer number (10250928).

Almost surely, 2^71709421 is an apocalyptic number.

It is an amenable number.

71709421 is a deficient number, since it is larger than the sum of its proper divisors (10298003).

71709421 is a wasteful number, since it uses less digits than its factorization.

71709421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6731.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 71709421 is about 8468.1415316467. The cubic root of 71709421 is about 415.4563538447.

The spelling of 71709421 in words is "seventy-one million, seven hundred nine thousand, four hundred twenty-one".