381873325681 has 3 divisors (see below), whose sum is σ = 381873943641. Its totient is φ = 381872707722.

The previous prime is 381873325643. The next prime is 381873325697. The reversal of 381873325681 is 186523378183.

The square root of 381873325681 is 617959.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 381873325681 - 2¹⁹ = 381872801393 is a prime.

It is a super-2 number, since 2×381873325681² (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 (381873325601) 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 2 ways as a sum of consecutive naturals, for example, 308980 + ... + 926938.

It is an arithmetic number, because the mean of its divisors is an integer number (127291314547).

Almost surely, 2^381873325681 is an apocalyptic number.

381873325681 is the 617959-th square number.

381873325681 is the 308980-th centered octagonal number.

It is an amenable number.

381873325681 is a deficient number, since it is larger than the sum of its proper divisors (617960).

381873325681 is an frugal number, since it uses more digits than its factorization.

381873325681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235918 (or 617959 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 55.

The spelling of 381873325681 in words is "three hundred eighty-one billion, eight hundred seventy-three million, three hundred twenty-five thousand, six hundred eighty-one".