11501550491 has 2 divisors, whose sum is σ = 11501550492. Its totient is φ = 11501550490.

The previous prime is 11501550479. The next prime is 11501550493. The reversal of 11501550491 is 19405510511.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11501550491 - 2¹⁰ = 11501549467 is a prime.

It is a Sophie Germain prime.

Together with 11501550493, 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 (11501550493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5750775245 + 5750775246.

It is an arithmetic number, because the mean of its divisors is an integer number (5750775246).

Almost surely, 2^11501550491 is an apocalyptic number.

11501550491 is a deficient number, since it is larger than the sum of its proper divisors (1).

11501550491 is an equidigital number, since it uses as much as digits as its factorization.

11501550491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4500, while the sum is 32.

The spelling of 11501550491 in words is "eleven billion, five hundred one million, five hundred fifty thousand, four hundred ninety-one".