281561378449 has 16 divisors (see below), whose sum is σ = 316785369600. Its totient is φ = 248302587456.

The previous prime is 281561378443. The next prime is 281561378531. The reversal of 281561378449 is 944873165182.

It is not a de Polignac number, because 281561378449 - 2²⁹ = 281024507537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 281561378393 and 281561378402.

It is not an unprimeable number, because it can be changed into a prime (281561378443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320089 + ... + 815830.

It is an arithmetic number, because the mean of its divisors is an integer number (19799085600).

Almost surely, 2^281561378449 is an apocalyptic number.

It is an amenable number.

281561378449 is a deficient number, since it is larger than the sum of its proper divisors (35223991151).

281561378449 is a wasteful number, since it uses less digits than its factorization.

281561378449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136784.

The product of its digits is 11612160, while the sum is 58.

The spelling of 281561378449 in words is "two hundred eighty-one billion, five hundred sixty-one million, three hundred seventy-eight thousand, four hundred forty-nine".