11320209491 has 2 divisors, whose sum is σ = 11320209492. Its totient is φ = 11320209490.

The previous prime is 11320209431. The next prime is 11320209559. The reversal of 11320209491 is 19490202311.

It is a weak prime.

It is an emirp because it is prime and its reverse (19490202311) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11320209491 is a prime.

It is not a weakly prime, because it can be changed into another prime (11320209401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5660104745 + 5660104746.

It is an arithmetic number, because the mean of its divisors is an integer number (5660104746).

Almost surely, 2^11320209491 is an apocalyptic number.

11320209491 is a deficient number, since it is larger than the sum of its proper divisors (1).

11320209491 is an equidigital number, since it uses as much as digits as its factorization.

11320209491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 32.

The spelling of 11320209491 in words is "eleven billion, three hundred twenty million, two hundred nine thousand, four hundred ninety-one".