205454057 has 2 divisors, whose sum is σ = 205454058. Its totient is φ = 205454056.

The previous prime is 205454021. The next prime is 205454059. The reversal of 205454057 is 750454502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 174662656 + 30791401 = 13216^2 + 5549^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205454057 is a prime.

It is a super-2 number, since 2×205454057² = 84422739075518498, which contains 22 as substring.

Together with 205454059, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (205454059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102727028 + 102727029.

It is an arithmetic number, because the mean of its divisors is an integer number (102727029).

Almost surely, 2^205454057 is an apocalyptic number.

It is an amenable number.

205454057 is a deficient number, since it is larger than the sum of its proper divisors (1).

205454057 is an equidigital number, since it uses as much as digits as its factorization.

205454057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28000, while the sum is 32.

The square root of 205454057 is about 14333.6686511165. The cubic root of 205454057 is about 590.0718642713.

The spelling of 205454057 in words is "two hundred five million, four hundred fifty-four thousand, fifty-seven".