381662771 has 4 divisors (see below), whose sum is σ = 436186032. Its totient is φ = 327139512.

The previous prime is 381662741. The next prime is 381662773. The reversal of 381662771 is 177266183.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-381662771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381662773) 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 3 ways as a sum of consecutive naturals, for example, 27261620 + ... + 27261633.

It is an arithmetic number, because the mean of its divisors is an integer number (109046508).

Almost surely, 2^381662771 is an apocalyptic number.

381662771 is a deficient number, since it is larger than the sum of its proper divisors (54523261).

381662771 is an equidigital number, since it uses as much as digits as its factorization.

381662771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54523260.

The product of its digits is 84672, while the sum is 41.

The square root of 381662771 is about 19536.1913125358. The cubic root of 381662771 is about 725.3705729805.

The spelling of 381662771 in words is "three hundred eighty-one million, six hundred sixty-two thousand, seven hundred seventy-one".