381121616 has 20 divisors (see below), whose sum is σ = 742140000. Its totient is φ = 189601632.

The previous prime is 381121613. The next prime is 381121649. The reversal of 381121616 is 616121183.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381121613) 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, 56666 + ... + 63033.

It is an arithmetic number, because the mean of its divisors is an integer number (37107000).

Almost surely, 2^381121616 is an apocalyptic number.

It is an amenable number.

381121616 is a deficient number, since it is larger than the sum of its proper divisors (361018384).

381121616 is a wasteful number, since it uses less digits than its factorization.

381121616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119906 (or 119900 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The square root of 381121616 is about 19522.3363355926. The cubic root of 381121616 is about 725.0275794503.

Adding to 381121616 its reverse (616121183), we get a palindrome (997242799).

The spelling of 381121616 in words is "three hundred eighty-one million, one hundred twenty-one thousand, six hundred sixteen".