381169169 has 4 divisors (see below), whose sum is σ = 390466020. Its totient is φ = 371872320.

The previous prime is 381169147. The next prime is 381169171. The reversal of 381169169 is 961961183.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 961961183 = 53 ⋅18150211.

It can be written as a sum of positive squares in 2 ways, for example, as 84916225 + 296252944 = 9215^2 + 17212^2 .

It is a cyclic number.

It is not a de Polignac number, because 381169169 - 2¹² = 381165073 is a prime.

It is a super-2 number, since 2×381169169² = 290579870792301122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381969169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4648364 + ... + 4648445.

It is an arithmetic number, because the mean of its divisors is an integer number (97616505).

Almost surely, 2^381169169 is an apocalyptic number.

It is an amenable number.

381169169 is a deficient number, since it is larger than the sum of its proper divisors (9296851).

381169169 is an equidigital number, since it uses as much as digits as its factorization.

381169169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9296850.

The product of its digits is 69984, while the sum is 44.

The square root of 381169169 is about 19523.5542102354. The cubic root of 381169169 is about 725.0577323824.

The spelling of 381169169 in words is "three hundred eighty-one million, one hundred sixty-nine thousand, one hundred sixty-nine".