381568781 has 24 divisors (see below), whose sum is σ = 440802432. Its totient is φ = 329410400.

The previous prime is 381568777. The next prime is 381568807. The reversal of 381568781 is 187865183.

It is a happy number.

It is not a de Polignac number, because 381568781 - 2² = 381568777 is a prime.

It is a super-2 number, since 2×381568781² = 291189469267651922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381568381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 464351 + ... + 465171.

It is an arithmetic number, because the mean of its divisors is an integer number (18366768).

Almost surely, 2^381568781 is an apocalyptic number.

It is an amenable number.

381568781 is a deficient number, since it is larger than the sum of its proper divisors (59233651).

381568781 is a wasteful number, since it uses less digits than its factorization.

381568781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033 (or 1022 counting only the distinct ones).

The product of its digits is 322560, while the sum is 47.

The square root of 381568781 is about 19533.7856290070. The cubic root of 381568781 is about 725.3110237461.

The spelling of 381568781 in words is "three hundred eighty-one million, five hundred sixty-eight thousand, seven hundred eighty-one".