1720435049 has 2 divisors, whose sum is σ = 1720435050. Its totient is φ = 1720435048.

The previous prime is 1720435021. The next prime is 1720435069. The reversal of 1720435049 is 9405340271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 894907225 + 825527824 = 29915^2 + 28732^2 .

It is a cyclic number.

It is not a de Polignac number, because 1720435049 - 2¹⁶ = 1720369513 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1720435069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860217524 + 860217525.

It is an arithmetic number, because the mean of its divisors is an integer number (860217525).

Almost surely, 2^1720435049 is an apocalyptic number.

It is an amenable number.

1720435049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720435049 is an equidigital number, since it uses as much as digits as its factorization.

1720435049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 1720435049 is about 41478.1273564755. The cubic root of 1720435049 is about 1198.2462922747.

The spelling of 1720435049 in words is "one billion, seven hundred twenty million, four hundred thirty-five thousand, forty-nine".