205506134 has 4 divisors (see below), whose sum is σ = 308259204. Its totient is φ = 102753066.

The previous prime is 205506131. The next prime is 205506139. The reversal of 205506134 is 431605502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 431605502 = 2 ⋅215802751.

It is a super-2 number, since 2×205506134² = 84465542223251912, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205506131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51376532 + ... + 51376535.

It is an arithmetic number, because the mean of its divisors is an integer number (77064801).

Almost surely, 2^205506134 is an apocalyptic number.

205506134 is a deficient number, since it is larger than the sum of its proper divisors (102753070).

205506134 is a wasteful number, since it uses less digits than its factorization.

205506134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102753069.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 205506134 is about 14335.4851330536. The cubic root of 205506134 is about 590.1217157676.

The spelling of 205506134 in words is "two hundred five million, five hundred six thousand, one hundred thirty-four".