205406293 has 2 divisors, whose sum is σ = 205406294. Its totient is φ = 205406292.

The previous prime is 205406273. The next prime is 205406423. The reversal of 205406293 is 392604502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140232964 + 65173329 = 11842^2 + 8073^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205406293 is a prime.

It is equal to p_11361694 and since 205406293 and 11361694 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205406273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102703146 + 102703147.

It is an arithmetic number, because the mean of its divisors is an integer number (102703147).

Almost surely, 2^205406293 is an apocalyptic number.

It is an amenable number.

205406293 is a deficient number, since it is larger than the sum of its proper divisors (1).

205406293 is an equidigital number, since it uses as much as digits as its factorization.

205406293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 205406293 is about 14332.0024072005. The cubic root of 205406293 is about 590.0261340526.

The spelling of 205406293 in words is "two hundred five million, four hundred six thousand, two hundred ninety-three".