205242623 has 2 divisors, whose sum is σ = 205242624. Its totient is φ = 205242622.

The previous prime is 205242619. The next prime is 205242629. The reversal of 205242623 is 326242502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205242623 - 2² = 205242619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205242592 and 205242601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205242629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102621311 + 102621312.

It is an arithmetic number, because the mean of its divisors is an integer number (102621312).

Almost surely, 2^205242623 is an apocalyptic number.

205242623 is a deficient number, since it is larger than the sum of its proper divisors (1).

205242623 is an equidigital number, since it uses as much as digits as its factorization.

205242623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 205242623 is about 14326.2913205058. The cubic root of 205242623 is about 589.8693792999.

The spelling of 205242623 in words is "two hundred five million, two hundred forty-two thousand, six hundred twenty-three".