381688453 has 2 divisors, whose sum is σ = 381688454. Its totient is φ = 381688452.

The previous prime is 381688451. The next prime is 381688477. The reversal of 381688453 is 354886183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 360316324 + 21372129 = 18982^2 + 4623^2 .

It is a cyclic number.

It is not a de Polignac number, because 381688453 - 2¹ = 381688451 is a prime.

Together with 381688451, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381688451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190844226 + 190844227.

It is an arithmetic number, because the mean of its divisors is an integer number (190844227).

Almost surely, 2^381688453 is an apocalyptic number.

It is an amenable number.

381688453 is a deficient number, since it is larger than the sum of its proper divisors (1).

381688453 is an equidigital number, since it uses as much as digits as its factorization.

381688453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 552960, while the sum is 46.

The square root of 381688453 is about 19536.8485943870. The cubic root of 381688453 is about 725.3868426219.

The spelling of 381688453 in words is "three hundred eighty-one million, six hundred eighty-eight thousand, four hundred fifty-three".