11233643891 has 2 divisors, whose sum is σ = 11233643892. Its totient is φ = 11233643890.

The previous prime is 11233643887. The next prime is 11233643921. The reversal of 11233643891 is 19834633211.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11233643891 - 2² = 11233643887 is a prime.

It is not a weakly prime, because it can be changed into another prime (11233643591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5616821945 + 5616821946.

It is an arithmetic number, because the mean of its divisors is an integer number (5616821946).

Almost surely, 2^11233643891 is an apocalyptic number.

11233643891 is a deficient number, since it is larger than the sum of its proper divisors (1).

11233643891 is an equidigital number, since it uses as much as digits as its factorization.

11233643891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 41.

The spelling of 11233643891 in words is "eleven billion, two hundred thirty-three million, six hundred forty-three thousand, eight hundred ninety-one".