385949581 has 2 divisors, whose sum is σ = 385949582. Its totient is φ = 385949580.

The previous prime is 385949573. The next prime is 385949593. The reversal of 385949581 is 185949583.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 385493956 + 455625 = 19634^2 + 675^2 .

It is a cyclic number.

It is not a de Polignac number, because 385949581 - 2³ = 385949573 is a prime.

It is a super-2 number, since 2×385949581² = 297914158148151122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385949561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192974790 + 192974791.

It is an arithmetic number, because the mean of its divisors is an integer number (192974791).

Almost surely, 2^385949581 is an apocalyptic number.

It is an amenable number.

385949581 is a deficient number, since it is larger than the sum of its proper divisors (1).

385949581 is an equidigital number, since it uses as much as digits as its factorization.

385949581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555200, while the sum is 52.

The square root of 385949581 is about 19645.5995327198. The cubic root of 385949581 is about 728.0762389716.

The spelling of 385949581 in words is "three hundred eighty-five million, nine hundred forty-nine thousand, five hundred eighty-one".