71173721 has 8 divisors (see below), whose sum is σ = 72443904. Its totient is φ = 69914880.

The previous prime is 71173717. The next prime is 71173723. The reversal of 71173721 is 12737117.

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 71173721 - 2² = 71173717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71173723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10361 + ... + 15801.

It is an arithmetic number, because the mean of its divisors is an integer number (9055488).

Almost surely, 2^71173721 is an apocalyptic number.

It is an amenable number.

71173721 is a deficient number, since it is larger than the sum of its proper divisors (1270183).

71173721 is a wasteful number, since it uses less digits than its factorization.

71173721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5671.

The product of its digits is 2058, while the sum is 29.

The square root of 71173721 is about 8436.4519200906. The cubic root of 71173721 is about 414.4192214696.

The spelling of 71173721 in words is "seventy-one million, one hundred seventy-three thousand, seven hundred twenty-one".