381569 has 2 divisors, whose sum is σ = 381570. Its totient is φ = 381568.

The previous prime is 381559. The next prime is 381607. The reversal of 381569 is 965183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 237169 + 144400 = 487^2 + 380^2 .

It is a cyclic number.

It is not a de Polignac number, because 381569 - 2¹⁶ = 316033 is a prime.

It is a super-2 number, since 2×381569² = 291189803522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (381509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190784 + 190785.

It is an arithmetic number, because the mean of its divisors is an integer number (190785).

2³⁸¹⁵⁶⁹ is an apocalyptic number.

It is an amenable number.

381569 is a deficient number, since it is larger than the sum of its proper divisors (1).

381569 is an equidigital number, since it uses as much as digits as its factorization.

381569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The square root of 381569 is about 617.7127163982. The cubic root of 381569 is about 72.5311162509.

The spelling of 381569 in words is "three hundred eighty-one thousand, five hundred sixty-nine".