205420541 has 2 divisors, whose sum is σ = 205420542. Its totient is φ = 205420540.

The previous prime is 205420517. The next prime is 205420547. The reversal of 205420541 is 145024502.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121771225 + 83649316 = 11035^2 + 9146^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205420541 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205420547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102710270 + 102710271.

It is an arithmetic number, because the mean of its divisors is an integer number (102710271).

Almost surely, 2^205420541 is an apocalyptic number.

It is an amenable number.

205420541 is a deficient number, since it is larger than the sum of its proper divisors (1).

205420541 is an equidigital number, since it uses as much as digits as its factorization.

205420541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 205420541 is about 14332.4994679923. The cubic root of 205420541 is about 590.0397761175.

The spelling of 205420541 in words is "two hundred five million, four hundred twenty thousand, five hundred forty-one".