381188881 has 2 divisors, whose sum is σ = 381188882. Its totient is φ = 381188880.

The previous prime is 381188839. The next prime is 381188903. The reversal of 381188881 is 188881183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 361608256 + 19580625 = 19016^2 + 4425^2 .

It is a cyclic number.

It is not a de Polignac number, because 381188881 - 2¹¹ = 381186833 is a prime.

It is a super-2 number, since 2×381188881² = 290609925996064322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (381188081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190594440 + 190594441.

It is an arithmetic number, because the mean of its divisors is an integer number (190594441).

Almost surely, 2^381188881 is an apocalyptic number.

It is an amenable number.

381188881 is a deficient number, since it is larger than the sum of its proper divisors (1).

381188881 is an equidigital number, since it uses as much as digits as its factorization.

381188881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 98304, while the sum is 46.

The square root of 381188881 is about 19524.0590298227. The cubic root of 381188881 is about 725.0702308501.

The spelling of 381188881 in words is "three hundred eighty-one million, one hundred eighty-eight thousand, eight hundred eighty-one".