381713209 has 4 divisors (see below), whose sum is σ = 385091316. Its totient is φ = 378335104.

The previous prime is 381713207. The next prime is 381713231. The reversal of 381713209 is 902317183.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49744809 + 331968400 = 7053^2 + 18220^2 .

It is a cyclic number.

It is not a de Polignac number, because 381713209 - 2¹ = 381713207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381713207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1688884 + ... + 1689109.

It is an arithmetic number, because the mean of its divisors is an integer number (96272829).

Almost surely, 2^381713209 is an apocalyptic number.

It is an amenable number.

381713209 is a deficient number, since it is larger than the sum of its proper divisors (3378107).

381713209 is a wasteful number, since it uses less digits than its factorization.

381713209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3378106.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 381713209 is about 19537.4821561019. The cubic root of 381713209 is about 725.4025249481.

The spelling of 381713209 in words is "three hundred eighty-one million, seven hundred thirteen thousand, two hundred nine".