205136929 has 2 divisors, whose sum is σ = 205136930. Its totient is φ = 205136928.

The previous prime is 205136927. The next prime is 205136941. The reversal of 205136929 is 929631502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205062400 + 74529 = 14320^2 + 273^2 .

It is a cyclic number.

It is not a de Polignac number, because 205136929 - 2¹ = 205136927 is a prime.

Together with 205136927, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (205136927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102568464 + 102568465.

It is an arithmetic number, because the mean of its divisors is an integer number (102568465).

Almost surely, 2^205136929 is an apocalyptic number.

It is an amenable number.

205136929 is a deficient number, since it is larger than the sum of its proper divisors (1).

205136929 is an equidigital number, since it uses as much as digits as its factorization.

205136929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 205136929 is about 14322.6020331503. The cubic root of 205136929 is about 589.7681067046.

The spelling of 205136929 in words is "two hundred five million, one hundred thirty-six thousand, nine hundred twenty-nine".