381568757 has 4 divisors (see below), whose sum is σ = 404013996. Its totient is φ = 359123520.

The previous prime is 381568727. The next prime is 381568763. The reversal of 381568757 is 757865183.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 335952241 + 45616516 = 18329^2 + 6754^2 .

It is a cyclic number.

It is not a de Polignac number, because 381568757 - 2¹⁰ = 381567733 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 (381568717) 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, 11222594 + ... + 11222627.

It is an arithmetic number, because the mean of its divisors is an integer number (101003499).

Almost surely, 2^381568757 is an apocalyptic number.

It is an amenable number.

381568757 is a deficient number, since it is larger than the sum of its proper divisors (22445239).

381568757 is a wasteful number, since it uses less digits than its factorization.

381568757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22445238.

The product of its digits is 1411200, while the sum is 50.

The square root of 381568757 is about 19533.7850146867. The cubic root of 381568757 is about 725.3110085392.

The spelling of 381568757 in words is "three hundred eighty-one million, five hundred sixty-eight thousand, seven hundred fifty-seven".