1721061 has 8 divisors (see below), whose sum is σ = 2549760. Its totient is φ = 1147356.

The previous prime is 1721023. The next prime is 1721081. The reversal of 1721061 is 1601271.

It is not a de Polignac number, because 1721061 - 2⁷ = 1720933 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721011) 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, 31845 + ... + 31898.

It is an arithmetic number, because the mean of its divisors is an integer number (318720).

2^1721061 is an apocalyptic number.

It is an amenable number.

1721061 is a deficient number, since it is larger than the sum of its proper divisors (828699).

1721061 is an equidigital number, since it uses as much as digits as its factorization.

1721061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63752 (or 63746 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 1721061 is about 1311.8921449570. The cubic root of 1721061 is about 119.8391595158.

It can be divided in two parts, 17210 and 61, that added together give a palindrome (17271).

The spelling of 1721061 in words is "one million, seven hundred twenty-one thousand, sixty-one".