381623969 has 2 divisors, whose sum is σ = 381623970. Its totient is φ = 381623968.

The previous prime is 381623929. The next prime is 381623993. The reversal of 381623969 is 969326183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 381616225 + 7744 = 19535^2 + 88^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381623969 is a prime.

It is a super-2 number, since 2×381623969² = 291273707430625922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (381623909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190811984 + 190811985.

It is an arithmetic number, because the mean of its divisors is an integer number (190811985).

Almost surely, 2^381623969 is an apocalyptic number.

It is an amenable number.

381623969 is a deficient number, since it is larger than the sum of its proper divisors (1).

381623969 is an equidigital number, since it uses as much as digits as its factorization.

381623969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 47.

The square root of 381623969 is about 19535.1982073385. The cubic root of 381623969 is about 725.3459903865.

The spelling of 381623969 in words is "three hundred eighty-one million, six hundred twenty-three thousand, nine hundred sixty-nine".