381533091 has 16 divisors (see below), whose sum is σ = 566985600. Its totient is φ = 226793088.

The previous prime is 381533069. The next prime is 381533111. The reversal of 381533091 is 190335183.

It is not a de Polignac number, because 381533091 - 2¹⁸ = 381270947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (381533021) 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 15 ways as a sum of consecutive naturals, for example, 195901 + ... + 197838.

It is an arithmetic number, because the mean of its divisors is an integer number (35436600).

Almost surely, 2^381533091 is an apocalyptic number.

381533091 is a deficient number, since it is larger than the sum of its proper divisors (185452509).

381533091 is a wasteful number, since it uses less digits than its factorization.

381533091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393778.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 381533091 is about 19532.8720622442. The cubic root of 381533091 is about 725.2884090749.

The spelling of 381533091 in words is "three hundred eighty-one million, five hundred thirty-three thousand, ninety-one".