205129473 has 4 divisors (see below), whose sum is σ = 273505968. Its totient is φ = 136752980.

The previous prime is 205129459. The next prime is 205129481. The reversal of 205129473 is 374921502.

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 not a de Polignac number, because 205129473 - 2⁹ = 205128961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205129493) 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, 34188243 + ... + 34188248.

It is an arithmetic number, because the mean of its divisors is an integer number (68376492).

Almost surely, 2^205129473 is an apocalyptic number.

It is an amenable number.

205129473 is a deficient number, since it is larger than the sum of its proper divisors (68376495).

205129473 is an equidigital number, since it uses as much as digits as its factorization.

205129473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68376494.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 205129473 is about 14322.3417428855. The cubic root of 205129473 is about 589.7609612915.

The spelling of 205129473 in words is "two hundred five million, one hundred twenty-nine thousand, four hundred seventy-three".