204161531 has 8 divisors (see below), whose sum is σ = 233912544. Its totient is φ = 174556800.

The previous prime is 204161473. The next prime is 204161539. The reversal of 204161531 is 135161402.

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 204161531 - 2¹⁸ = 203899387 is a prime.

It is a super-2 number, since 2×204161531² = 83363861480527922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204161497 and 204161506.

It is not an unprimeable number, because it can be changed into a prime (204161539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33560 + ... + 39173.

It is an arithmetic number, because the mean of its divisors is an integer number (29239068).

Almost surely, 2^204161531 is an apocalyptic number.

204161531 is a deficient number, since it is larger than the sum of its proper divisors (29751013).

204161531 is an equidigital number, since it uses as much as digits as its factorization.

204161531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73141.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 204161531 is about 14288.5104542076. The cubic root of 204161531 is about 588.8318657112.

The spelling of 204161531 in words is "two hundred four million, one hundred sixty-one thousand, five hundred thirty-one".