205441631 has 4 divisors (see below), whose sum is σ = 208507992. Its totient is φ = 202375272.

The previous prime is 205441601. The next prime is 205441673. The reversal of 205441631 is 136144502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205441631 is a prime.

It is a super-2 number, since 2×205441631² = 84412527495880322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205441631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205441601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1533080 + ... + 1533213.

It is an arithmetic number, because the mean of its divisors is an integer number (52126998).

Almost surely, 2^205441631 is an apocalyptic number.

205441631 is a deficient number, since it is larger than the sum of its proper divisors (3066361).

205441631 is an equidigital number, since it uses as much as digits as its factorization.

205441631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3066360.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 205441631 is about 14333.2351895865. The cubic root of 205441631 is about 590.0599680500.

The spelling of 205441631 in words is "two hundred five million, four hundred forty-one thousand, six hundred thirty-one".