205148302489 has 9 divisors (see below), whose sum is σ = 222149212509. Its totient is φ = 189362228640.

The previous prime is 205148302459. The next prime is 205148302493. The reversal of 205148302489 is 984203841502.

The square root of 205148302489 is 452933.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 102935097225 + 102213205264 = 320835^2 + 319708^2 .

It is not a de Polignac number, because 205148302489 - 2³³ = 196558367897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205148302409) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5870709 + ... + 5905549.

Almost surely, 2^205148302489 is an apocalyptic number.

205148302489 is the 452933-rd square number.

205148302489 is the 226467-th centered octagonal number.

It is an amenable number.

205148302489 is a deficient number, since it is larger than the sum of its proper divisors (17000910020).

205148302489 is an frugal number, since it uses more digits than its factorization.

205148302489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69708 (or 34854 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 46.

The spelling of 205148302489 in words is "two hundred five billion, one hundred forty-eight million, three hundred two thousand, four hundred eighty-nine".