205129534 has 4 divisors (see below), whose sum is σ = 307694304. Its totient is φ = 102564766.

The previous prime is 205129523. The next prime is 205129549. The reversal of 205129534 is 435921502.

205129534 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 is a junction number, because it is equal to n+sod(n) for n = 205129496 and 205129505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51282382 + ... + 51282385.

It is an arithmetic number, because the mean of its divisors is an integer number (76923576).

Almost surely, 2^205129534 is an apocalyptic number.

205129534 is a deficient number, since it is larger than the sum of its proper divisors (102564770).

205129534 is a wasteful number, since it uses less digits than its factorization.

205129534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102564769.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 205129534 is about 14322.3438724254. The cubic root of 205129534 is about 589.7610197512.

The spelling of 205129534 in words is "two hundred five million, one hundred twenty-nine thousand, five hundred thirty-four".