205142345 has 8 divisors (see below), whose sum is σ = 254112000. Its totient is φ = 158819760.

The previous prime is 205142321. The next prime is 205142363. The reversal of 205142345 is 543241502.

It is a happy number.

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

It is not a de Polignac number, because 205142345 - 2²⁴ = 188365129 is a prime.

It is a Curzon number.

It is an unprimeable number.

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, 661595 + ... + 661904.

It is an arithmetic number, because the mean of its divisors is an integer number (31764000).

Almost surely, 2^205142345 is an apocalyptic number.

It is an amenable number.

205142345 is a deficient number, since it is larger than the sum of its proper divisors (48969655).

205142345 is a wasteful number, since it uses less digits than its factorization.

205142345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1323535.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 205142345 is about 14322.7911036920. The cubic root of 205142345 is about 589.7732969873.

Adding to 205142345 its reverse (543241502), we get a palindrome (748383847).

The spelling of 205142345 in words is "two hundred five million, one hundred forty-two thousand, three hundred forty-five".