381805731173 has 4 divisors (see below), whose sum is σ = 382390426668. Its totient is φ = 381221035680.

The previous prime is 381805731113. The next prime is 381805731199. The reversal of 381805731173 is 371137508183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 371137508183 = 13 ⋅28549039091.

It can be written as a sum of positive squares in 2 ways, for example, as 254597948929 + 127207782244 = 504577^2 + 356662^2 .

It is a cyclic number.

It is not a de Polignac number, because 381805731173 - 2¹² = 381805727077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381805731113) 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, 292346768 + ... + 292348073.

It is an arithmetic number, because the mean of its divisors is an integer number (95597606667).

Almost surely, 2^381805731173 is an apocalyptic number.

It is an amenable number.

381805731173 is a deficient number, since it is larger than the sum of its proper divisors (584695495).

381805731173 is an equidigital number, since it uses as much as digits as its factorization.

381805731173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584695494.

The product of its (nonzero) digits is 423360, while the sum is 47.

The spelling of 381805731173 in words is "three hundred eighty-one billion, eight hundred five million, seven hundred thirty-one thousand, one hundred seventy-three".