206150621 has 4 divisors (see below), whose sum is σ = 206202492. Its totient is φ = 206098752.

The previous prime is 206150617. The next prime is 206150629. The reversal of 206150621 is 126051602.

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 111302500 + 94848121 = 10550^2 + 9739^2 .

It is a cyclic number.

It is not a de Polignac number, because 206150621 - 2² = 206150617 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 (206150629) 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, 19430 + ... + 28103.

It is an arithmetic number, because the mean of its divisors is an integer number (51550623).

Almost surely, 2^206150621 is an apocalyptic number.

It is an amenable number.

206150621 is a deficient number, since it is larger than the sum of its proper divisors (51871).

206150621 is an equidigital number, since it uses as much as digits as its factorization.

206150621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51870.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 206150621 is about 14357.9462667890. The cubic root of 206150621 is about 590.7379648282.

The spelling of 206150621 in words is "two hundred six million, one hundred fifty thousand, six hundred twenty-one".