999999999967231 has 2 divisors, whose sum is σ = 999999999967232. Its totient is φ = 999999999967230.

The previous prime is 999999999967159. The next prime is 999999999967253. The reversal of 999999999967231 is 132769999999999.

It is a strong prime.

It is an emirp because it is prime and its reverse (132769999999999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999999999967231 is a prime.

It is a super-2 number, since 2×999999999967231² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999999999967531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499999999983615 + 499999999983616.

It is an arithmetic number, because the mean of its divisors is an integer number (499999999983616).

Almost surely, 2^{999999999967231} is an apocalyptic number.

999999999967231 is a deficient number, since it is larger than the sum of its proper divisors (1).

999999999967231 is an equidigital number, since it uses as much as digits as its factorization.

999999999967231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 878669669052, while the sum is 109.

It can be divided in two parts, 999999999 and 967231, that multiplied together give a palindrome (967230999032769).

The spelling of 999999999967231 in words is "nine hundred ninety-nine trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred sixty-seven thousand, two hundred thirty-one".