206405497 has 2 divisors, whose sum is σ = 206405498. Its totient is φ = 206405496.

The previous prime is 206405491. The next prime is 206405501. The reversal of 206405497 is 794504602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203233536 + 3171961 = 14256^2 + 1781^2 .

It is a cyclic number.

It is not a de Polignac number, because 206405497 - 2²⁷ = 72187769 is a prime.

It is not a weakly prime, because it can be changed into another prime (206405491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103202748 + 103202749.

It is an arithmetic number, because the mean of its divisors is an integer number (103202749).

Almost surely, 2^206405497 is an apocalyptic number.

It is an amenable number.

206405497 is a deficient number, since it is larger than the sum of its proper divisors (1).

206405497 is an equidigital number, since it uses as much as digits as its factorization.

206405497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 206405497 is about 14366.8193070004. The cubic root of 206405497 is about 590.9813191301.

The spelling of 206405497 in words is "two hundred six million, four hundred five thousand, four hundred ninety-seven".