381867851 has 2 divisors, whose sum is σ = 381867852. Its totient is φ = 381867850.

The previous prime is 381867841. The next prime is 381867859. The reversal of 381867851 is 158768183.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381867851 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 381867796 and 381867805.

It is not a weakly prime, because it can be changed into another prime (381867859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190933925 + 190933926.

It is an arithmetic number, because the mean of its divisors is an integer number (190933926).

Almost surely, 2^381867851 is an apocalyptic number.

381867851 is a deficient number, since it is larger than the sum of its proper divisors (1).

381867851 is an equidigital number, since it uses as much as digits as its factorization.

381867851 is an evil number, because the sum of its binary digits is even.

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

The square root of 381867851 is about 19541.4393277466. The cubic root of 381867851 is about 725.5004715647.

The spelling of 381867851 in words is "three hundred eighty-one million, eight hundred sixty-seven thousand, eight hundred fifty-one".