381533587 has 2 divisors, whose sum is σ = 381533588. Its totient is φ = 381533586.

The previous prime is 381533573. The next prime is 381533597. The reversal of 381533587 is 785335183.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381533587 is a prime.

It is not a weakly prime, because it can be changed into another prime (381533507) 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 as a sum of consecutive naturals, namely, 190766793 + 190766794.

It is an arithmetic number, because the mean of its divisors is an integer number (190766794).

Almost surely, 2^381533587 is an apocalyptic number.

381533587 is a deficient number, since it is larger than the sum of its proper divisors (1).

381533587 is an equidigital number, since it uses as much as digits as its factorization.

381533587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 43.

The square root of 381533587 is about 19532.8847587856. The cubic root of 381533587 is about 725.2887233708.

The spelling of 381533587 in words is "three hundred eighty-one million, five hundred thirty-three thousand, five hundred eighty-seven".