381684554549 has 4 divisors (see below), whose sum is σ = 385186247820. Its totient is φ = 378182861280.

The previous prime is 381684554501. The next prime is 381684554567. The reversal of 381684554549 is 945455486183.

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 185776516324 + 195908038225 = 431018^2 + 442615^2 .

It is a cyclic number.

It is not a de Polignac number, because 381684554549 - 2³⁶ = 312965077813 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 381684554491 and 381684554500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381684554569) 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, 1750846472 + ... + 1750846689.

It is an arithmetic number, because the mean of its divisors is an integer number (96296561955).

Almost surely, 2^381684554549 is an apocalyptic number.

It is an amenable number.

381684554549 is a deficient number, since it is larger than the sum of its proper divisors (3501693271).

381684554549 is a wasteful number, since it uses less digits than its factorization.

381684554549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3501693270.

The product of its digits is 82944000, while the sum is 62.

The spelling of 381684554549 in words is "three hundred eighty-one billion, six hundred eighty-four million, five hundred fifty-four thousand, five hundred forty-nine".