206651121 has 4 divisors (see below), whose sum is σ = 275534832. Its totient is φ = 137767412.

The previous prime is 206651119. The next prime is 206651131. The reversal of 206651121 is 121156602.

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.

It is a cyclic number.

It is not a de Polignac number, because 206651121 - 2¹ = 206651119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 206651091 and 206651100.

It is not an unprimeable number, because it can be changed into a prime (206651131) 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, 34441851 + ... + 34441856.

It is an arithmetic number, because the mean of its divisors is an integer number (68883708).

Almost surely, 2^206651121 is an apocalyptic number.

It is an amenable number.

206651121 is a deficient number, since it is larger than the sum of its proper divisors (68883711).

206651121 is an equidigital number, since it uses as much as digits as its factorization.

206651121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68883710.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 206651121 is about 14375.3650736251. The cubic root of 206651121 is about 591.2156501848.

The spelling of 206651121 in words is "two hundred six million, six hundred fifty-one thousand, one hundred twenty-one".