381681507 has 4 divisors (see below), whose sum is σ = 508908680. Its totient is φ = 254454336.

The previous prime is 381681497. The next prime is 381681511. The reversal of 381681507 is 705186183.

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

It is not a de Polignac number, because 381681507 - 2⁴ = 381681491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381681577) 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, 63613582 + ... + 63613587.

It is an arithmetic number, because the mean of its divisors is an integer number (127227170).

Almost surely, 2^381681507 is an apocalyptic number.

381681507 is a deficient number, since it is larger than the sum of its proper divisors (127227173).

381681507 is a wasteful number, since it uses less digits than its factorization.

381681507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127227172.

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 381681507 is about 19536.6708269347. The cubic root of 381681507 is about 725.3824423774.

The spelling of 381681507 in words is "three hundred eighty-one million, six hundred eighty-one thousand, five hundred seven".