205131461 has 4 divisors (see below), whose sum is σ = 205446252. Its totient is φ = 204816672.

The previous prime is 205131449. The next prime is 205131473. The reversal of 205131461 is 164131502.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (205131449) and next prime (205131473).

It can be written as a sum of positive squares in 2 ways, for example, as 56535361 + 148596100 = 7519^2 + 12190^2 .

It is a cyclic number.

It is not a de Polignac number, because 205131461 - 2¹⁴ = 205115077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205131491) 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 in 3 ways as a sum of consecutive naturals, for example, 156416 + ... + 157721.

It is an arithmetic number, because the mean of its divisors is an integer number (51361563).

Almost surely, 2^205131461 is an apocalyptic number.

It is an amenable number.

205131461 is a deficient number, since it is larger than the sum of its proper divisors (314791).

205131461 is an equidigital number, since it uses as much as digits as its factorization.

205131461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314790.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 205131461 is about 14322.4111447759. The cubic root of 205131461 is about 589.7628664964.

Adding to 205131461 its reverse (164131502), we get a palindrome (369262963).

The spelling of 205131461 in words is "two hundred five million, one hundred thirty-one thousand, four hundred sixty-one".