11891911601 has 2 divisors, whose sum is σ = 11891911602. Its totient is φ = 11891911600.

The previous prime is 11891911583. The next prime is 11891911609. The reversal of 11891911601 is 10611919811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10930911601 + 961000000 = 104551^2 + 31000^2 .

It is an emirp because it is prime and its reverse (10611919811) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 10911616811 and 11861611901.

It is a cyclic number.

It is not a de Polignac number, because 11891911601 - 2²² = 11887717297 is a prime.

It is not a weakly prime, because it can be changed into another prime (11891911609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5945955800 + 5945955801.

It is an arithmetic number, because the mean of its divisors is an integer number (5945955801).

Almost surely, 2^11891911601 is an apocalyptic number.

It is an amenable number.

11891911601 is a deficient number, since it is larger than the sum of its proper divisors (1).

11891911601 is an equidigital number, since it uses as much as digits as its factorization.

11891911601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 38.

The spelling of 11891911601 in words is "eleven billion, eight hundred ninety-one million, nine hundred eleven thousand, six hundred one".