205150621 has 6 divisors (see below), whose sum is σ = 222145530. Its totient is φ = 189369648.

The previous prime is 205150613. The next prime is 205150697. The reversal of 205150621 is 126051502.

It can be written as a sum of positive squares in 3 ways, for example, as 16088121 + 189062500 = 4011^2 + 13750^2 .

It is not a de Polignac number, because 205150621 - 2³ = 205150613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205150592 and 205150601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205151621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 606786 + ... + 607123.

It is an arithmetic number, because the mean of its divisors is an integer number (37024255).

Almost surely, 2^205150621 is an apocalyptic number.

It is an amenable number.

205150621 is a deficient number, since it is larger than the sum of its proper divisors (16994909).

205150621 is a wasteful number, since it uses less digits than its factorization.

205150621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1213935 (or 1213922 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 205150621 is about 14323.0800109474. The cubic root of 205150621 is about 589.7812279001.

The spelling of 205150621 in words is "two hundred five million, one hundred fifty thousand, six hundred twenty-one".