1720667101 has 4 divisors (see below), whose sum is σ = 1753132572. Its totient is φ = 1688201632.

The previous prime is 1720667051. The next prime is 1720667119. The reversal of 1720667101 is 1017660271.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1303282201 + 417384900 = 36101^2 + 20430^2 .

It is a cyclic number.

It is not a de Polignac number, because 1720667101 - 2¹¹ = 1720665053 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 (1720667141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16232656 + ... + 16232761.

It is an arithmetic number, because the mean of its divisors is an integer number (438283143).

Almost surely, 2^1720667101 is an apocalyptic number.

It is an amenable number.

1720667101 is a deficient number, since it is larger than the sum of its proper divisors (32465471).

1720667101 is an equidigital number, since it uses as much as digits as its factorization.

1720667101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32465470.

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

The square root of 1720667101 is about 41480.9245436984. The cubic root of 1720667101 is about 1198.3001629412.

The spelling of 1720667101 in words is "one billion, seven hundred twenty million, six hundred sixty-seven thousand, one hundred one".