205313239 has 2 divisors, whose sum is σ = 205313240. Its totient is φ = 205313238.

The previous prime is 205313237. The next prime is 205313257. The reversal of 205313239 is 932313502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205313239 - 2¹ = 205313237 is a prime.

It is a super-2 number, since 2×205313239² = 84307052217342242, which contains 22 as substring.

Together with 205313237, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205313237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102656619 + 102656620.

It is an arithmetic number, because the mean of its divisors is an integer number (102656620).

Almost surely, 2^205313239 is an apocalyptic number.

205313239 is a deficient number, since it is larger than the sum of its proper divisors (1).

205313239 is an equidigital number, since it uses as much as digits as its factorization.

205313239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 28.

The square root of 205313239 is about 14328.7556682358. The cubic root of 205313239 is about 589.9370219094.

The spelling of 205313239 in words is "two hundred five million, three hundred thirteen thousand, two hundred thirty-nine".