206031121 has 4 divisors (see below), whose sum is σ = 206388772. Its totient is φ = 205673472.

The previous prime is 206031113. The next prime is 206031157. The reversal of 206031121 is 121130602.

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 97121025 + 108910096 = 9855^2 + 10436^2 .

It is a cyclic number.

It is not a de Polignac number, because 206031121 - 2³ = 206031113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 206031095 and 206031104.

It is not an unprimeable number, because it can be changed into a prime (206031101) 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, 177960 + ... + 179113.

It is an arithmetic number, because the mean of its divisors is an integer number (51597193).

Almost surely, 2^206031121 is an apocalyptic number.

It is an amenable number.

206031121 is a deficient number, since it is larger than the sum of its proper divisors (357651).

206031121 is an equidigital number, since it uses as much as digits as its factorization.

206031121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357650.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 206031121 is about 14353.7842048709. The cubic root of 206031121 is about 590.6237977673.

Adding to 206031121 its reverse (121130602), we get a palindrome (327161723).

The spelling of 206031121 in words is "two hundred six million, thirty-one thousand, one hundred twenty-one".