205431121 has 8 divisors (see below), whose sum is σ = 236334464. Its totient is φ = 174916800.

The previous prime is 205431113. The next prime is 205431137. The reversal of 205431121 is 121134502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205431121 - 2³ = 205431113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205431181) 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 7 ways as a sum of consecutive naturals, for example, 96120 + ... + 98233.

It is an arithmetic number, because the mean of its divisors is an integer number (29541808).

Almost surely, 2^205431121 is an apocalyptic number.

It is an amenable number.

205431121 is a deficient number, since it is larger than the sum of its proper divisors (30903343).

205431121 is a wasteful number, since it uses less digits than its factorization.

205431121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194511.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 205431121 is about 14332.8685544799. The cubic root of 205431121 is about 590.0499057661.

Adding to 205431121 its reverse (121134502), we get a palindrome (326565623).

The spelling of 205431121 in words is "two hundred five million, four hundred thirty-one thousand, one hundred twenty-one".