381969851 has 2 divisors, whose sum is σ = 381969852. Its totient is φ = 381969850.

The previous prime is 381969839. The next prime is 381969857. The reversal of 381969851 is 158969183.

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-381969851 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 381969851.

It is not a weakly prime, because it can be changed into another prime (381969857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190984925 + 190984926.

It is an arithmetic number, because the mean of its divisors is an integer number (190984926).

Almost surely, 2^381969851 is an apocalyptic number.

381969851 is a deficient number, since it is larger than the sum of its proper divisors (1).

381969851 is an equidigital number, since it uses as much as digits as its factorization.

381969851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 50.

The square root of 381969851 is about 19544.0489919566. The cubic root of 381969851 is about 725.5650615008.

The spelling of 381969851 in words is "three hundred eighty-one million, nine hundred sixty-nine thousand, eight hundred fifty-one".