381688315 has 4 divisors (see below), whose sum is σ = 458025984. Its totient is φ = 305350648.

The previous prime is 381688313. The next prime is 381688331. The reversal of 381688315 is 513886183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 513886183 = 17 ⋅30228599.

It is a cyclic number.

It is not a de Polignac number, because 381688315 - 2¹ = 381688313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381688313) 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, 38168827 + ... + 38168836.

It is an arithmetic number, because the mean of its divisors is an integer number (114506496).

Almost surely, 2^381688315 is an apocalyptic number.

381688315 is a deficient number, since it is larger than the sum of its proper divisors (76337669).

381688315 is an equidigital number, since it uses as much as digits as its factorization.

381688315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76337668.

The product of its digits is 138240, while the sum is 43.

The square root of 381688315 is about 19536.8450625990. The cubic root of 381688315 is about 725.3867552004.

The spelling of 381688315 in words is "three hundred eighty-one million, six hundred eighty-eight thousand, three hundred fifteen".