381613 has 4 divisors (see below), whose sum is σ = 383328. Its totient is φ = 379900.

The previous prime is 381607. The next prime is 381629. The reversal of 381613 is 316183.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381613 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463 + ... + 988.

It is an arithmetic number, because the mean of its divisors is an integer number (95832).

2³⁸¹⁶¹³ is an apocalyptic number.

It is an amenable number.

381613 is a deficient number, since it is larger than the sum of its proper divisors (1715).

381613 is a wasteful number, since it uses less digits than its factorization.

381613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1714.

The product of its digits is 432, while the sum is 22.

The square root of 381613 is about 617.7483306331. The cubic root of 381613 is about 72.5339040791.

Adding to 381613 its reverse (316183), we get a palindrome (697796).

The spelling of 381613 in words is "three hundred eighty-one thousand, six hundred thirteen".