1720255769 has 2 divisors, whose sum is σ = 1720255770. Its totient is φ = 1720255768.

The previous prime is 1720255729. The next prime is 1720255793. The reversal of 1720255769 is 9675520271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1651365769 + 68890000 = 40637^2 + 8300^2 .

It is a cyclic number.

It is not a de Polignac number, because 1720255769 - 2¹⁶ = 1720190233 is a prime.

It is a super-2 number, since 2×1720255769² = 5918559821555562722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1720255709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860127884 + 860127885.

It is an arithmetic number, because the mean of its divisors is an integer number (860127885).

Almost surely, 2^1720255769 is an apocalyptic number.

It is an amenable number.

1720255769 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720255769 is an equidigital number, since it uses as much as digits as its factorization.

1720255769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 264600, while the sum is 44.

The square root of 1720255769 is about 41475.9661611396. The cubic root of 1720255769 is about 1198.2046692643.

The spelling of 1720255769 in words is "one billion, seven hundred twenty million, two hundred fifty-five thousand, seven hundred sixty-nine".