205224137 has 4 divisors (see below), whose sum is σ = 209590656. Its totient is φ = 200857620.

The previous prime is 205224133. The next prime is 205224157. The reversal of 205224137 is 731422502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 731422502 = 2 ⋅365711251.

It is a cyclic number.

It is not a de Polignac number, because 205224137 - 2² = 205224133 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205224133) 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, 2183189 + ... + 2183282.

It is an arithmetic number, because the mean of its divisors is an integer number (52397664).

Almost surely, 2^205224137 is an apocalyptic number.

It is an amenable number.

205224137 is a deficient number, since it is larger than the sum of its proper divisors (4366519).

205224137 is an equidigital number, since it uses as much as digits as its factorization.

205224137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4366518.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 205224137 is about 14325.6461285347. The cubic root of 205224137 is about 589.8516691177.

Adding to 205224137 its reverse (731422502), we get a palindrome (936646639).

The spelling of 205224137 in words is "two hundred five million, two hundred twenty-four thousand, one hundred thirty-seven".