999855751441 has 4 divisors (see below), whose sum is σ = 999857816884. Its totient is φ = 999853686000.

The previous prime is 999855751379. The next prime is 999855751463. The reversal of 999855751441 is 144157558999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 144157558999 = 139 ⋅1037104741.

It can be written as a sum of positive squares in 2 ways, for example, as 461203974400 + 538651777041 = 679120^2 + 733929^2 .

It is a 3-Lehmer number, since φ(999855751441) divides (999855751441-1)³.

It is a cyclic number.

It is not a de Polignac number, because 999855751441 - 2¹⁹ = 999855227153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999855751481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129091 + ... + 1419991.

It is an arithmetic number, because the mean of its divisors is an integer number (249964454221).

It is a Poulet number, since it divides 2^999855751440-1.

Almost surely, 2^999855751441 is an apocalyptic number.

It is an amenable number.

999855751441 is a deficient number, since it is larger than the sum of its proper divisors (2065443).

999855751441 is a wasteful number, since it uses less digits than its factorization.

999855751441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2065442.

The product of its digits is 81648000, while the sum is 67.

The spelling of 999855751441 in words is "nine hundred ninety-nine billion, eight hundred fifty-five million, seven hundred fifty-one thousand, four hundred forty-one".