285233621 has 4 divisors (see below), whose sum is σ = 289909644. Its totient is φ = 280557600.

The previous prime is 285233591. The next prime is 285233659. The reversal of 285233621 is 126332582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126332582 = 2 ⋅63166291.

It can be written as a sum of positive squares in 2 ways, for example, as 27984100 + 257249521 = 5290^2 + 16039^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285233621 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 (285233321) 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, 2337920 + ... + 2338041.

It is an arithmetic number, because the mean of its divisors is an integer number (72477411).

Almost surely, 2^285233621 is an apocalyptic number.

It is an amenable number.

285233621 is a deficient number, since it is larger than the sum of its proper divisors (4676023).

285233621 is an equidigital number, since it uses as much as digits as its factorization.

285233621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4676022.

The product of its digits is 17280, while the sum is 32.

The square root of 285233621 is about 16888.8608556054. The cubic root of 285233621 is about 658.2642030207.

The spelling of 285233621 in words is "two hundred eighty-five million, two hundred thirty-three thousand, six hundred twenty-one".