206553251 has 4 divisors (see below), whose sum is σ = 206585904. Its totient is φ = 206520600.

The previous prime is 206553241. The next prime is 206553253. The reversal of 206553251 is 152355602.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 206553251 - 2¹⁴ = 206536867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206553253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3455 + ... + 20616.

It is an arithmetic number, because the mean of its divisors is an integer number (51646476).

Almost surely, 2^206553251 is an apocalyptic number.

206553251 is a deficient number, since it is larger than the sum of its proper divisors (32653).

206553251 is an equidigital number, since it uses as much as digits as its factorization.

206553251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32652.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 206553251 is about 14371.9605830242. The cubic root of 206553251 is about 591.1223021750.

The spelling of 206553251 in words is "two hundred six million, five hundred fifty-three thousand, two hundred fifty-one".