205442131 has 4 divisors (see below), whose sum is σ = 206506792. Its totient is φ = 204377472.

The previous prime is 205442099. The next prime is 205442143. The reversal of 205442131 is 131244502.

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 205442131 - 2⁵ = 205442099 is a prime.

It is a super-2 number, since 2×205442131² = 84412938379642322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203442131) 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, 532041 + ... + 532426.

It is an arithmetic number, because the mean of its divisors is an integer number (51626698).

Almost surely, 2^205442131 is an apocalyptic number.

205442131 is a deficient number, since it is larger than the sum of its proper divisors (1064661).

205442131 is a wasteful number, since it uses less digits than its factorization.

205442131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064660.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 205442131 is about 14333.2526315558. The cubic root of 205442131 is about 590.0604467419.

Adding to 205442131 its reverse (131244502), we get a palindrome (336686633).

The spelling of 205442131 in words is "two hundred five million, four hundred forty-two thousand, one hundred thirty-one".