381681573 has 64 divisors (see below), whose sum is σ = 661893120. Its totient is φ = 190130688.

The previous prime is 381681551. The next prime is 381681577. The reversal of 381681573 is 375186183.

381681573 is nontrivially palindromic in base 4.

It is not a de Polignac number, because 381681573 - 2⁵ = 381681541 is a prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381681577) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 558490 + ... + 559172.

It is an arithmetic number, because the mean of its divisors is an integer number (10342080).

Almost surely, 2^381681573 is an apocalyptic number.

It is an amenable number.

381681573 is a deficient number, since it is larger than the sum of its proper divisors (280211547).

381681573 is a wasteful number, since it uses less digits than its factorization.

381681573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818.

The product of its digits is 120960, while the sum is 42.

The square root of 381681573 is about 19536.6725160658. The cubic root of 381681573 is about 725.3824841882.

The spelling of 381681573 in words is "three hundred eighty-one million, six hundred eighty-one thousand, five hundred seventy-three".