381825869 has 2 divisors, whose sum is σ = 381825870. Its totient is φ = 381825868.

The previous prime is 381825827. The next prime is 381825887. The reversal of 381825869 is 968528183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 353064100 + 28761769 = 18790^2 + 5363^2 .

It is a cyclic number.

It is not a de Polignac number, because 381825869 - 2²⁸ = 113390413 is a prime.

It is a super-2 number, since 2×381825869² = 291581988475210322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381825809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190912934 + 190912935.

It is an arithmetic number, because the mean of its divisors is an integer number (190912935).

Almost surely, 2^381825869 is an apocalyptic number.

It is an amenable number.

381825869 is a deficient number, since it is larger than the sum of its proper divisors (1).

381825869 is an equidigital number, since it uses as much as digits as its factorization.

381825869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 829440, while the sum is 50.

The square root of 381825869 is about 19540.3651194137. The cubic root of 381825869 is about 725.4738837656.

The spelling of 381825869 in words is "three hundred eighty-one million, eight hundred twenty-five thousand, eight hundred sixty-nine".