205485931 has 8 divisors (see below), whose sum is σ = 247201280. Its totient is φ = 166860648.

The previous prime is 205485923. The next prime is 205485941. The reversal of 205485931 is 139584502.

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 205485931 - 2³ = 205485923 is a prime.

It is a super-2 number, since 2×205485931² = 84448935677873522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205485911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 772371 + ... + 772636.

It is an arithmetic number, because the mean of its divisors is an integer number (30900160).

Almost surely, 2^205485931 is an apocalyptic number.

205485931 is a deficient number, since it is larger than the sum of its proper divisors (41715349).

205485931 is a wasteful number, since it uses less digits than its factorization.

205485931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545033.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 205485931 is about 14334.7804657065. The cubic root of 205485931 is about 590.1023771401.

The spelling of 205485931 in words is "two hundred five million, four hundred eighty-five thousand, nine hundred thirty-one".