1720271 has 4 divisors (see below), whose sum is σ = 1966032. Its totient is φ = 1474512.

The previous prime is 1720231. The next prime is 1720273.

1720271 is nontrivially palindromic in base 10.

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-1720271 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 (1720273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122870 + ... + 122883.

It is an arithmetic number, because the mean of its divisors is an integer number (491508).

2^1720271 is an apocalyptic number.

1720271 is a deficient number, since it is larger than the sum of its proper divisors (245761).

1720271 is an equidigital number, since it uses as much as digits as its factorization.

1720271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245760.

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 1720271 is about 1311.5910185725. The cubic root of 1720271 is about 119.8208205522.

It can be divided in two parts, 1720 and 271, that added together give a palindrome (1991).

The spelling of 1720271 in words is "one million, seven hundred twenty thousand, two hundred seventy-one".