17120719909 has 2 divisors, whose sum is σ = 17120719910. Its totient is φ = 17120719908.

The previous prime is 17120719877. The next prime is 17120719943. The reversal of 17120719909 is 90991702171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16978871809 + 141848100 = 130303^2 + 11910^2 .

It is a cyclic number.

It is not a de Polignac number, because 17120719909 - 2⁵ = 17120719877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17120719969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8560359954 + 8560359955.

It is an arithmetic number, because the mean of its divisors is an integer number (8560359955).

Almost surely, 2^17120719909 is an apocalyptic number.

It is an amenable number.

17120719909 is a deficient number, since it is larger than the sum of its proper divisors (1).

17120719909 is an equidigital number, since it uses as much as digits as its factorization.

17120719909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 71442, while the sum is 46.

The spelling of 17120719909 in words is "seventeen billion, one hundred twenty million, seven hundred nineteen thousand, nine hundred nine".