671721701 has 8 divisors (see below), whose sum is σ = 769194240. Its totient is φ = 574627248.

The previous prime is 671721683. The next prime is 671721709. The reversal of 671721701 is 107127176.

It is a happy number.

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 671721701 - 2⁶ = 671721637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671721709) 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, 90701 + ... + 97826.

It is an arithmetic number, because the mean of its divisors is an integer number (96149280).

Almost surely, 2^671721701 is an apocalyptic number.

It is an amenable number.

671721701 is a deficient number, since it is larger than the sum of its proper divisors (97472539).

671721701 is a wasteful number, since it uses less digits than its factorization.

671721701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189043.

The product of its (nonzero) digits is 4116, while the sum is 32.

The square root of 671721701 is about 25917.5944292675. The cubic root of 671721701 is about 875.7828970165.

Adding to 671721701 its reverse (107127176), we get a palindrome (778848877).

The spelling of 671721701 in words is "six hundred seventy-one million, seven hundred twenty-one thousand, seven hundred one".