205463641 has 2 divisors, whose sum is σ = 205463642. Its totient is φ = 205463640.

The previous prime is 205463639. The next prime is 205463689. The reversal of 205463641 is 146364502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192654400 + 12809241 = 13880^2 + 3579^2 .

It is a cyclic number.

It is not a de Polignac number, because 205463641 - 2¹ = 205463639 is a prime.

Together with 205463639, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (205463611) by changing a digit.

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 as a sum of consecutive naturals, namely, 102731820 + 102731821.

It is an arithmetic number, because the mean of its divisors is an integer number (102731821).

Almost surely, 2^205463641 is an apocalyptic number.

It is an amenable number.

205463641 is a deficient number, since it is larger than the sum of its proper divisors (1).

205463641 is an equidigital number, since it uses as much as digits as its factorization.

205463641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 205463641 is about 14334.0029649781. The cubic root of 205463641 is about 590.0810393328.

The spelling of 205463641 in words is "two hundred five million, four hundred sixty-three thousand, six hundred forty-one".