205458145 has 4 divisors (see below), whose sum is σ = 246549780. Its totient is φ = 164366512.

The previous prime is 205458109. The next prime is 205458163. The reversal of 205458145 is 541854502.

It is a happy number.

205458145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 139783329 + 65674816 = 11823^2 + 8104^2 .

It is a cyclic number.

It is not a de Polignac number, because 205458145 - 2¹³ = 205449953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205458145.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20545810 + ... + 20545819.

It is an arithmetic number, because the mean of its divisors is an integer number (61637445).

Almost surely, 2^205458145 is an apocalyptic number.

It is an amenable number.

205458145 is a deficient number, since it is larger than the sum of its proper divisors (41091635).

205458145 is an equidigital number, since it uses as much as digits as its factorization.

205458145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41091634.

The product of its (nonzero) digits is 32000, while the sum is 34.

The square root of 205458145 is about 14333.8112517223. The cubic root of 205458145 is about 590.0757778758.

The spelling of 205458145 in words is "two hundred five million, four hundred fifty-eight thousand, one hundred forty-five".