11905193081 has 2 divisors, whose sum is σ = 11905193082. Its totient is φ = 11905193080.

The previous prime is 11905193051. The next prime is 11905193087. The reversal of 11905193081 is 18039150911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10911682681 + 993510400 = 104459^2 + 31520^2 .

It is an emirp because it is prime and its reverse (18039150911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11905193081 - 2²² = 11900998777 is a prime.

It is a super-2 number, since 2×11905193081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11905193087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5952596540 + 5952596541.

It is an arithmetic number, because the mean of its divisors is an integer number (5952596541).

Almost surely, 2^11905193081 is an apocalyptic number.

It is an amenable number.

11905193081 is a deficient number, since it is larger than the sum of its proper divisors (1).

11905193081 is an equidigital number, since it uses as much as digits as its factorization.

11905193081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 38.

The spelling of 11905193081 in words is "eleven billion, nine hundred five million, one hundred ninety-three thousand, eighty-one".