11621728187 has 2 divisors, whose sum is σ = 11621728188. Its totient is φ = 11621728186.

The previous prime is 11621728147. The next prime is 11621728201. The reversal of 11621728187 is 78182712611.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11621728187 - 2²⁰ = 11620679611 is a prime.

It is not a weakly prime, because it can be changed into another prime (11621728127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5810864093 + 5810864094.

It is an arithmetic number, because the mean of its divisors is an integer number (5810864094).

Almost surely, 2^11621728187 is an apocalyptic number.

11621728187 is a deficient number, since it is larger than the sum of its proper divisors (1).

11621728187 is an equidigital number, since it uses as much as digits as its factorization.

11621728187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75264, while the sum is 44.

The spelling of 11621728187 in words is "eleven billion, six hundred twenty-one million, seven hundred twenty-eight thousand, one hundred eighty-seven".