285209093 has 4 divisors (see below), whose sum is σ = 307148268. Its totient is φ = 263269920.

The previous prime is 285209069. The next prime is 285209101. The reversal of 285209093 is 390902582.

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 57259489 + 227949604 = 7567^2 + 15098^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285209093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285209053) 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, 10969568 + ... + 10969593.

It is an arithmetic number, because the mean of its divisors is an integer number (76787067).

Almost surely, 2^285209093 is an apocalyptic number.

It is an amenable number.

285209093 is a deficient number, since it is larger than the sum of its proper divisors (21939175).

285209093 is a wasteful number, since it uses less digits than its factorization.

285209093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21939174.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 285209093 is about 16888.1346808936. The cubic root of 285209093 is about 658.2453338482.

The spelling of 285209093 in words is "two hundred eighty-five million, two hundred nine thousand, ninety-three".