205242331 has 6 divisors (see below), whose sum is σ = 238751340. Its totient is φ = 175921956.

The previous prime is 205242329. The next prime is 205242337. The reversal of 205242331 is 133242502.

It is not a de Polignac number, because 205242331 - 2¹ = 205242329 is a prime.

It is a super-2 number, since 2×205242331² = 84248828868627122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205242337) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2094261 + ... + 2094358.

It is an arithmetic number, because the mean of its divisors is an integer number (39791890).

Almost surely, 2^205242331 is an apocalyptic number.

205242331 is a deficient number, since it is larger than the sum of its proper divisors (33509009).

205242331 is an equidigital number, since it uses as much as digits as its factorization.

205242331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4188633 (or 4188626 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 205242331 is about 14326.2811294488. The cubic root of 205242331 is about 589.8690995628.

Adding to 205242331 its reverse (133242502), we get a palindrome (338484833).

The spelling of 205242331 in words is "two hundred five million, two hundred forty-two thousand, three hundred thirty-one".