999999951191089 has 2 divisors, whose sum is σ = 999999951191090. Its totient is φ = 999999951191088.

The previous prime is 999999951191039. The next prime is 999999951191147. The reversal of 999999951191089 is 980191159999999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 715578978094864 + 284420973096225 = 26750308^2 + 16864785^2 .

It is a cyclic number.

It is not a de Polignac number, because 999999951191089 - 2¹⁷ = 999999951060017 is a prime.

It is not a weakly prime, because it can be changed into another prime (999999951191039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999975595544 + 499999975595545.

It is an arithmetic number, because the mean of its divisors is an integer number (499999975595545).

Almost surely, 2^{999999951191089} is an apocalyptic number.

It is an amenable number.

999999951191089 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999951191089 is an equidigital number, since it uses as much as digits as its factorization.

999999951191089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15496819560, while the sum is 97.

The spelling of 999999951191089 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred fifty-one million, one hundred ninety-one thousand, eighty-nine".