385735561 has 2 divisors, whose sum is σ = 385735562. Its totient is φ = 385735560.

The previous prime is 385735543. The next prime is 385735613. The reversal of 385735561 is 165537583.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 375623161 + 10112400 = 19381^2 + 3180^2 .

It is a cyclic number.

It is not a de Polignac number, because 385735561 - 2⁵ = 385735529 is a prime.

It is not a weakly prime, because it can be changed into another prime (385735501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192867780 + 192867781.

It is an arithmetic number, because the mean of its divisors is an integer number (192867781).

Almost surely, 2^385735561 is an apocalyptic number.

It is an amenable number.

385735561 is a deficient number, since it is larger than the sum of its proper divisors (1).

385735561 is an equidigital number, since it uses as much as digits as its factorization.

385735561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 378000, while the sum is 43.

The square root of 385735561 is about 19640.1517560328. The cubic root of 385735561 is about 727.9416344395.

The spelling of 385735561 in words is "three hundred eighty-five million, seven hundred thirty-five thousand, five hundred sixty-one".