205261153 has 2 divisors, whose sum is σ = 205261154. Its totient is φ = 205261152.

The previous prime is 205261139. The next prime is 205261169. The reversal of 205261153 is 351162502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128663649 + 76597504 = 11343^2 + 8752^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205261153 is a prime.

It is not a weakly prime, because it can be changed into another prime (205261193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102630576 + 102630577.

It is an arithmetic number, because the mean of its divisors is an integer number (102630577).

Almost surely, 2^205261153 is an apocalyptic number.

It is an amenable number.

205261153 is a deficient number, since it is larger than the sum of its proper divisors (1).

205261153 is an equidigital number, since it uses as much as digits as its factorization.

205261153 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 205261153 is about 14326.9380189907. The cubic root of 205261153 is about 589.8871305683.

The spelling of 205261153 in words is "two hundred five million, two hundred sixty-one thousand, one hundred fifty-three".