11943900569 has 2 divisors, whose sum is σ = 11943900570. Its totient is φ = 11943900568.

The previous prime is 11943900491. The next prime is 11943900571. The reversal of 11943900569 is 96500934911.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8178850969 + 3765049600 = 90437^2 + 61360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11943900569 is a prime.

It is a super-2 number, since 2×11943900569² (a number of 21 digits) contains 22 as substring.

Together with 11943900571, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11943900169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5971950284 + 5971950285.

It is an arithmetic number, because the mean of its divisors is an integer number (5971950285).

Almost surely, 2^11943900569 is an apocalyptic number.

It is an amenable number.

11943900569 is a deficient number, since it is larger than the sum of its proper divisors (1).

11943900569 is an equidigital number, since it uses as much as digits as its factorization.

11943900569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 47.

The spelling of 11943900569 in words is "eleven billion, nine hundred forty-three million, nine hundred thousand, five hundred sixty-nine".