999054975491 has 2 divisors, whose sum is σ = 999054975492. Its totient is φ = 999054975490.

The previous prime is 999054975379. The next prime is 999054975509. The reversal of 999054975491 is 194579450999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999054975491 - 2¹⁸ = 999054713347 is a prime.

It is a super-2 number, since 2×999054975491² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999054975991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499527487745 + 499527487746.

It is an arithmetic number, because the mean of its divisors is an integer number (499527487746).

Almost surely, 2^999054975491 is an apocalyptic number.

999054975491 is a deficient number, since it is larger than the sum of its proper divisors (1).

999054975491 is an equidigital number, since it uses as much as digits as its factorization.

999054975491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165337200, while the sum is 71.

The spelling of 999054975491 in words is "nine hundred ninety-nine billion, fifty-four million, nine hundred seventy-five thousand, four hundred ninety-one".