381556813 has 8 divisors (see below), whose sum is σ = 416462976. Its totient is φ = 346687200.

The previous prime is 381556811. The next prime is 381556859. The reversal of 381556813 is 318655183.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 381556813 - 2¹ = 381556811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381556811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15628 + ... + 31738.

It is an arithmetic number, because the mean of its divisors is an integer number (52057872).

Almost surely, 2^381556813 is an apocalyptic number.

It is an amenable number.

381556813 is a deficient number, since it is larger than the sum of its proper divisors (34906163).

381556813 is a wasteful number, since it uses less digits than its factorization.

381556813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18275.

The product of its digits is 86400, while the sum is 40.

The square root of 381556813 is about 19533.4792855753. The cubic root of 381556813 is about 725.3034404797.

The spelling of 381556813 in words is "three hundred eighty-one million, five hundred fifty-six thousand, eight hundred thirteen".