381163649 has 2 divisors, whose sum is σ = 381163650. Its totient is φ = 381163648.

The previous prime is 381163621. The next prime is 381163669. The reversal of 381163649 is 946361183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 237930625 + 143233024 = 15425^2 + 11968^2 .

It is a cyclic number.

It is not a de Polignac number, because 381163649 - 2¹² = 381159553 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (381163669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190581824 + 190581825.

It is an arithmetic number, because the mean of its divisors is an integer number (190581825).

Almost surely, 2^381163649 is an apocalyptic number.

It is an amenable number.

381163649 is a deficient number, since it is larger than the sum of its proper divisors (1).

381163649 is an equidigital number, since it uses as much as digits as its factorization.

381163649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 41.

The square root of 381163649 is about 19523.4128420212. The cubic root of 381163649 is about 725.0542323284.

The spelling of 381163649 in words is "three hundred eighty-one million, one hundred sixty-three thousand, six hundred forty-nine".