381458509 has 2 divisors, whose sum is σ = 381458510. Its totient is φ = 381458508.

The previous prime is 381458491. The next prime is 381458527. The reversal of 381458509 is 905854183.

It is a balanced prime because it is at equal distance from previous prime (381458491) and next prime (381458527).

It can be written as a sum of positive squares in only one way, i.e., 347934409 + 33524100 = 18653^2 + 5790^2 .

It is a cyclic number.

It is not a de Polignac number, because 381458509 - 2¹³ = 381450317 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381458549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190729254 + 190729255.

It is an arithmetic number, because the mean of its divisors is an integer number (190729255).

Almost surely, 2^381458509 is an apocalyptic number.

It is an amenable number.

381458509 is a deficient number, since it is larger than the sum of its proper divisors (1).

381458509 is an equidigital number, since it uses as much as digits as its factorization.

381458509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 43.

The square root of 381458509 is about 19530.9628282888. The cubic root of 381458509 is about 725.2411462585.

The spelling of 381458509 in words is "three hundred eighty-one million, four hundred fifty-eight thousand, five hundred nine".