381615409 has 4 divisors (see below), whose sum is σ = 436131904. Its totient is φ = 327098916.

The previous prime is 381615407. The next prime is 381615433. The reversal of 381615409 is 904516183.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 381615409 - 2¹ = 381615407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381615401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27258237 + ... + 27258250.

It is an arithmetic number, because the mean of its divisors is an integer number (109032976).

Almost surely, 2^381615409 is an apocalyptic number.

It is an amenable number.

381615409 is a deficient number, since it is larger than the sum of its proper divisors (54516495).

381615409 is an equidigital number, since it uses as much as digits as its factorization.

381615409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54516494.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 381615409 is about 19534.9791143989. The cubic root of 381615409 is about 725.3405670653.

The spelling of 381615409 in words is "three hundred eighty-one million, six hundred fifteen thousand, four hundred nine".