1781048454281 has 4 divisors (see below), whose sum is σ = 1783070076564. Its totient is φ = 1779026832000.

The previous prime is 1781048454271. The next prime is 1781048454343. The reversal of 1781048454281 is 1824548401871.

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 1072589564281 + 708458890000 = 1035659^2 + 841700^2 .

It is a cyclic number.

It is not a de Polignac number, because 1781048454281 - 2⁶ = 1781048454217 is a prime.

It is a super-2 number, since 2×1781048454281² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1781048454221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1010809820 + ... + 1010811581.

It is an arithmetic number, because the mean of its divisors is an integer number (445767519141).

Almost surely, 2^{1781048454281} is an apocalyptic number.

It is an amenable number.

1781048454281 is a deficient number, since it is larger than the sum of its proper divisors (2021622283).

1781048454281 is an equidigital number, since it uses as much as digits as its factorization.

1781048454281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2021622282.

The product of its (nonzero) digits is 2293760, while the sum is 53.

The spelling of 1781048454281 in words is "one trillion, seven hundred eighty-one billion, forty-eight million, four hundred fifty-four thousand, two hundred eighty-one".