381130857 has 6 divisors (see below), whose sum is σ = 550522362. Its totient is φ = 254087232.

The previous prime is 381130819. The next prime is 381130859. The reversal of 381130857 is 758031183.

It can be written as a sum of positive squares in only one way, i.e., 229249881 + 151880976 = 15141^2 + 12324^2 .

It is not a de Polignac number, because 381130857 - 2¹⁴ = 381114473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (381130859) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21173928 + ... + 21173945.

It is an arithmetic number, because the mean of its divisors is an integer number (91753727).

Almost surely, 2^381130857 is an apocalyptic number.

It is an amenable number.

381130857 is a deficient number, since it is larger than the sum of its proper divisors (169391505).

381130857 is a wasteful number, since it uses less digits than its factorization.

381130857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42347879 (or 42347876 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 381130857 is about 19522.5730117728. The cubic root of 381130857 is about 725.0334392821.

The spelling of 381130857 in words is "three hundred eighty-one million, one hundred thirty thousand, eight hundred fifty-seven".