1720867013 has 2 divisors, whose sum is σ = 1720867014. Its totient is φ = 1720867012.

The previous prime is 1720866967. The next prime is 1720867051. The reversal of 1720867013 is 3107680271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1091509444 + 629357569 = 33038^2 + 25087^2 .

It is an emirp because it is prime and its reverse (3107680271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1720867013 - 2⁶ = 1720866949 is a prime.

It is a super-2 number, since 2×1720867013² = 5922766552863084338, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1720860013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860433506 + 860433507.

It is an arithmetic number, because the mean of its divisors is an integer number (860433507).

Almost surely, 2^1720867013 is an apocalyptic number.

It is an amenable number.

1720867013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720867013 is an equidigital number, since it uses as much as digits as its factorization.

1720867013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 1720867013 is about 41483.3341596357. The cubic root of 1720867013 is about 1198.3465684516.

The spelling of 1720867013 in words is "one billion, seven hundred twenty million, eight hundred sixty-seven thousand, thirteen".