205454213 has 4 divisors (see below), whose sum is σ = 205787820. Its totient is φ = 205120608.

The previous prime is 205454159. The next prime is 205454219. The reversal of 205454213 is 312454502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312454502 = 2 ⋅156227251.

It can be written as a sum of positive squares in 2 ways, for example, as 64272289 + 141181924 = 8017^2 + 11882^2 .

It is a cyclic number.

It is not a de Polignac number, because 205454213 - 2⁶ = 205454149 is a prime.

It is a super-2 number, since 2×205454213² = 84422867278898738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205454219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165878 + ... + 167111.

It is an arithmetic number, because the mean of its divisors is an integer number (51446955).

Almost surely, 2^205454213 is an apocalyptic number.

It is an amenable number.

205454213 is a deficient number, since it is larger than the sum of its proper divisors (333607).

205454213 is an equidigital number, since it uses as much as digits as its factorization.

205454213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333606.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 205454213 is about 14333.6740928486. The cubic root of 205454213 is about 590.0720136172.

The spelling of 205454213 in words is "two hundred five million, four hundred fifty-four thousand, two hundred thirteen".