999634121073281 has 2 divisors, whose sum is σ = 999634121073282. Its totient is φ = 999634121073280.

The previous prime is 999634121073239. The next prime is 999634121073283. The reversal of 999634121073281 is 182370121436999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 556324633306225 + 443309487767056 = 23586535^2 + 21054916^2 .

It is a cyclic number.

It is not a de Polignac number, because 999634121073281 - 2³⁸ = 999359243166337 is a prime.

It is a super-2 number, since 2×999634121073281² (a number of 31 digits) contains 22 as substring.

Together with 999634121073283, 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 (999634121073283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499817060536640 + 499817060536641.

It is an arithmetic number, because the mean of its divisors is an integer number (499817060536641).

Almost surely, 2^{999634121073281} is an apocalyptic number.

It is an amenable number.

999634121073281 is a deficient number, since it is larger than the sum of its proper divisors (1).

999634121073281 is an equidigital number, since it uses as much as digits as its factorization.

999634121073281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35271936, while the sum is 65.

The spelling of 999634121073281 in words is "nine hundred ninety-nine trillion, six hundred thirty-four billion, one hundred twenty-one million, seventy-three thousand, two hundred eighty-one".