381533 has 2 divisors, whose sum is σ = 381534. Its totient is φ = 381532.

The previous prime is 381529. The next prime is 381541. The reversal of 381533 is 335183.

381533 is nontrivially palindromic in base 2.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 267289 + 114244 = 517^2 + 338^2 .

It is a cyclic number.

It is not a de Polignac number, because 381533 - 2² = 381529 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 381499 and 381508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381523) 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 as a sum of consecutive naturals, namely, 190766 + 190767.

It is an arithmetic number, because the mean of its divisors is an integer number (190767).

2³⁸¹⁵³³ is an apocalyptic number.

It is an amenable number.

381533 is a deficient number, since it is larger than the sum of its proper divisors (1).

381533 is an equidigital number, since it uses as much as digits as its factorization.

381533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 23.

The square root of 381533 is about 617.6835759513. The cubic root of 381533 is about 72.5288351412.

The spelling of 381533 in words is "three hundred eighty-one thousand, five hundred thirty-three".