11721430169 has 2 divisors, whose sum is σ = 11721430170. Its totient is φ = 11721430168.

The previous prime is 11721430153. The next prime is 11721430211. The reversal of 11721430169 is 96103412711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5977609225 + 5743820944 = 77315^2 + 75788^2 .

It is an emirp because it is prime and its reverse (96103412711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11721430169 - 2⁴ = 11721430153 is a prime.

It is a super-2 number, since 2×11721430169² (a number of 21 digits) contains 22 as substring.

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 (11721430069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5860715084 + 5860715085.

It is an arithmetic number, because the mean of its divisors is an integer number (5860715085).

Almost surely, 2^11721430169 is an apocalyptic number.

It is an amenable number.

11721430169 is a deficient number, since it is larger than the sum of its proper divisors (1).

11721430169 is an equidigital number, since it uses as much as digits as its factorization.

11721430169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

It can be divided in two parts, 1172 and 1430169, that added together give a palindrome (1431341).

The spelling of 11721430169 in words is "eleven billion, seven hundred twenty-one million, four hundred thirty thousand, one hundred sixty-nine".