11550231491 has 2 divisors, whose sum is σ = 11550231492. Its totient is φ = 11550231490.

The previous prime is 11550231439. The next prime is 11550231493. The reversal of 11550231491 is 19413205511.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11550231491 is a prime.

Together with 11550231493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11550231493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5775115745 + 5775115746.

It is an arithmetic number, because the mean of its divisors is an integer number (5775115746).

Almost surely, 2^11550231491 is an apocalyptic number.

11550231491 is a deficient number, since it is larger than the sum of its proper divisors (1).

11550231491 is an equidigital number, since it uses as much as digits as its factorization.

11550231491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 32.

The spelling of 11550231491 in words is "eleven billion, five hundred fifty million, two hundred thirty-one thousand, four hundred ninety-one".