381491156 has 24 divisors (see below), whose sum is σ = 697631424. Its totient is φ = 182191680.

The previous prime is 381491147. The next prime is 381491161. The reversal of 381491156 is 651194183.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72056 + ... + 77168.

It is an arithmetic number, because the mean of its divisors is an integer number (29067976).

Almost surely, 2^381491156 is an apocalyptic number.

It is an amenable number.

381491156 is a deficient number, since it is larger than the sum of its proper divisors (316140268).

381491156 is a wasteful number, since it uses less digits than its factorization.

381491156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5951 (or 5949 counting only the distinct ones).

The product of its digits is 25920, while the sum is 38.

The square root of 381491156 is about 19531.7985858958. The cubic root of 381491156 is about 725.2618355093.

The spelling of 381491156 in words is "three hundred eighty-one million, four hundred ninety-one thousand, one hundred fifty-six".