204243531 has 8 divisors (see below), whose sum is σ = 281109504. Its totient is φ = 131769960.

The previous prime is 204243527. The next prime is 204243539. The reversal of 204243531 is 135342402.

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

It is not a de Polignac number, because 204243531 - 2² = 204243527 is a prime.

It is a super-2 number, since 2×204243531² = 83430839910695922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (204243539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1097991 + ... + 1098176.

It is an arithmetic number, because the mean of its divisors is an integer number (35138688).

Almost surely, 2^204243531 is an apocalyptic number.

204243531 is a deficient number, since it is larger than the sum of its proper divisors (76865973).

204243531 is a wasteful number, since it uses less digits than its factorization.

204243531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2196201.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 204243531 is about 14291.3796045028. The cubic root of 204243531 is about 588.9106885104.

Adding to 204243531 its reverse (135342402), we get a palindrome (339585933).

The spelling of 204243531 in words is "two hundred four million, two hundred forty-three thousand, five hundred thirty-one".