385003561 has 4 divisors (see below), whose sum is σ = 385945300. Its totient is φ = 384061824.

The previous prime is 385003559. The next prime is 385003583. The reversal of 385003561 is 165300583.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 192349161 + 192654400 = 13869^2 + 13880^2 .

It is a cyclic number.

It is not a de Polignac number, because 385003561 - 2¹ = 385003559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (385003361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 470256 + ... + 471073.

It is an arithmetic number, because the mean of its divisors is an integer number (96486325).

Almost surely, 2^385003561 is an apocalyptic number.

It is an amenable number.

385003561 is a deficient number, since it is larger than the sum of its proper divisors (941739).

385003561 is an equidigital number, since it uses as much as digits as its factorization.

385003561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941738.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 385003561 is about 19621.5076128212. The cubic root of 385003561 is about 727.4808777739.

The spelling of 385003561 in words is "three hundred eighty-five million, three thousand, five hundred sixty-one".