381781235512 has 32 divisors (see below), whose sum is σ = 775574751600. Its totient is φ = 175483574784.

The previous prime is 381781235497. The next prime is 381781235543. The reversal of 381781235512 is 215532187183.

It is a super-3 number, since 3×381781235512³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32636187 + ... + 32647882.

Almost surely, 2^381781235512 is an apocalyptic number.

It is an amenable number.

381781235512 is an abundant number, since it is smaller than the sum of its proper divisors (393793516088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

381781235512 is a wasteful number, since it uses less digits than its factorization.

381781235512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65284135 (or 65284131 counting only the distinct ones).

The product of its digits is 403200, while the sum is 46.

The spelling of 381781235512 in words is "three hundred eighty-one billion, seven hundred eighty-one million, two hundred thirty-five thousand, five hundred twelve".