205449953 has 2 divisors, whose sum is σ = 205449954. Its totient is φ = 205449952.

The previous prime is 205449943. The next prime is 205449967. The reversal of 205449953 is 359944502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128414224 + 77035729 = 11332^2 + 8777^2 .

It is a cyclic number.

It is not a de Polignac number, because 205449953 - 2¹² = 205445857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205449953.

It is not a weakly prime, because it can be changed into another prime (205449943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102724976 + 102724977.

It is an arithmetic number, because the mean of its divisors is an integer number (102724977).

Almost surely, 2^205449953 is an apocalyptic number.

It is an amenable number.

205449953 is a deficient number, since it is larger than the sum of its proper divisors (1).

205449953 is an equidigital number, since it uses as much as digits as its factorization.

205449953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 205449953 is about 14333.5254909600. The cubic root of 205449953 is about 590.0679352971.

The spelling of 205449953 in words is "two hundred five million, four hundred forty-nine thousand, nine hundred fifty-three".