205122739 has 2 divisors, whose sum is σ = 205122740. Its totient is φ = 205122738.

The previous prime is 205122721. The next prime is 205122817. The reversal of 205122739 is 937221502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205122739 - 2⁷ = 205122611 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205122739.

It is not a weakly prime, because it can be changed into another prime (205122719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102561369 + 102561370.

It is an arithmetic number, because the mean of its divisors is an integer number (102561370).

Almost surely, 2^205122739 is an apocalyptic number.

205122739 is a deficient number, since it is larger than the sum of its proper divisors (1).

205122739 is an equidigital number, since it uses as much as digits as its factorization.

205122739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 205122739 is about 14322.1066537015. The cubic root of 205122739 is about 589.7545076540.

The spelling of 205122739 in words is "two hundred five million, one hundred twenty-two thousand, seven hundred thirty-nine".