844152251449 has 4 divisors (see below), whose sum is σ = 909087040036. Its totient is φ = 779217462864.

The previous prime is 844152251443. The next prime is 844152251479. The reversal of 844152251449 is 944152251448.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 478421222400 + 365731029049 = 691680^2 + 604757^2 .

It is a cyclic number.

It is not a de Polignac number, because 844152251449 - 2³ = 844152251441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (844152251441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32467394274 + ... + 32467394299.

It is an arithmetic number, because the mean of its divisors is an integer number (227271760009).

Almost surely, 2^844152251449 is an apocalyptic number.

It is an amenable number.

844152251449 is a deficient number, since it is larger than the sum of its proper divisors (64934788587).

844152251449 is a wasteful number, since it uses less digits than its factorization.

844152251449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64934788586.

The product of its digits is 1843200, while the sum is 49.

Subtracting 844152251449 from its reverse (944152251448), we obtain a palindrome (99999999999).

The spelling of 844152251449 in words is "eight hundred forty-four billion, one hundred fifty-two million, two hundred fifty-one thousand, four hundred forty-nine".