205154489 has 4 divisors (see below), whose sum is σ = 206513280. Its totient is φ = 203795700.

The previous prime is 205154461. The next prime is 205154491. The reversal of 205154489 is 984451502.

205154489 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205154489 is a prime.

It is a super-2 number, since 2×205154489² = 84176728713702242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205154449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 679169 + ... + 679470.

It is an arithmetic number, because the mean of its divisors is an integer number (51628320).

Almost surely, 2^205154489 is an apocalyptic number.

It is an amenable number.

205154489 is a deficient number, since it is larger than the sum of its proper divisors (1358791).

205154489 is a wasteful number, since it uses less digits than its factorization.

205154489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1358790.

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 205154489 is about 14323.2150371346. The cubic root of 205154489 is about 589.7849345417.

The spelling of 205154489 in words is "two hundred five million, one hundred fifty-four thousand, four hundred eighty-nine".