205251439 has 2 divisors, whose sum is σ = 205251440. Its totient is φ = 205251438.

The previous prime is 205251407. The next prime is 205251463. The reversal of 205251439 is 934152502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205251439 - 2⁵ = 205251407 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205251439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205251479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102625719 + 102625720.

It is an arithmetic number, because the mean of its divisors is an integer number (102625720).

Almost surely, 2^205251439 is an apocalyptic number.

205251439 is a deficient number, since it is larger than the sum of its proper divisors (1).

205251439 is an equidigital number, since it uses as much as digits as its factorization.

205251439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 205251439 is about 14326.5990032527. The cubic root of 205251439 is about 589.8778249368.

The spelling of 205251439 in words is "two hundred five million, two hundred fifty-one thousand, four hundred thirty-nine".