385689581 has 2 divisors, whose sum is σ = 385689582. Its totient is φ = 385689580.

The previous prime is 385689541. The next prime is 385689611. The reversal of 385689581 is 185986583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 322741225 + 62948356 = 17965^2 + 7934^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-385689581 is a prime.

It is a super-2 number, since 2×385689581² = 297512905783911122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385689541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192844790 + 192844791.

It is an arithmetic number, because the mean of its divisors is an integer number (192844791).

Almost surely, 2^385689581 is an apocalyptic number.

It is an amenable number.

385689581 is a deficient number, since it is larger than the sum of its proper divisors (1).

385689581 is an equidigital number, since it uses as much as digits as its factorization.

385689581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2073600, while the sum is 53.

The square root of 385689581 is about 19638.9811599278. The cubic root of 385689581 is about 727.9127095405.

The spelling of 385689581 in words is "three hundred eighty-five million, six hundred eighty-nine thousand, five hundred eighty-one".