11544213991 has 2 divisors, whose sum is σ = 11544213992. Its totient is φ = 11544213990.

The previous prime is 11544213979. The next prime is 11544214007. The reversal of 11544213991 is 19931244511.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11544213991 - 2⁵ = 11544213959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11544213911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5772106995 + 5772106996.

It is an arithmetic number, because the mean of its divisors is an integer number (5772106996).

Almost surely, 2^11544213991 is an apocalyptic number.

11544213991 is a deficient number, since it is larger than the sum of its proper divisors (1).

11544213991 is an equidigital number, since it uses as much as digits as its factorization.

11544213991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 40.

The spelling of 11544213991 in words is "eleven billion, five hundred forty-four million, two hundred thirteen thousand, nine hundred ninety-one".