381405784481 has 4 divisors (see below), whose sum is σ = 381435116100. Its totient is φ = 381376452864.

The previous prime is 381405784471. The next prime is 381405784489. The reversal of 381405784481 is 184487504183.

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 22047498256 + 359358286225 = 148484^2 + 599465^2 .

It is a cyclic number.

It is not a de Polignac number, because 381405784481 - 2¹⁴ = 381405768097 is a prime.

It is a super-2 number, since 2×381405784481² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381405784489) 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 3 ways as a sum of consecutive naturals, for example, 14646296 + ... + 14672313.

It is an arithmetic number, because the mean of its divisors is an integer number (95358779025).

Almost surely, 2^381405784481 is an apocalyptic number.

It is an amenable number.

381405784481 is a deficient number, since it is larger than the sum of its proper divisors (29331619).

381405784481 is a wasteful number, since it uses less digits than its factorization.

381405784481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29331618.

The product of its (nonzero) digits is 3440640, while the sum is 53.

The spelling of 381405784481 in words is "three hundred eighty-one billion, four hundred five million, seven hundred eighty-four thousand, four hundred eighty-one".