205246813 has 2 divisors, whose sum is σ = 205246814. Its totient is φ = 205246812.

The previous prime is 205246777. The next prime is 205246823. The reversal of 205246813 is 318642502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108951844 + 96294969 = 10438^2 + 9813^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205246813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205246823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102623406 + 102623407.

It is an arithmetic number, because the mean of its divisors is an integer number (102623407).

Almost surely, 2^205246813 is an apocalyptic number.

It is an amenable number.

205246813 is a deficient number, since it is larger than the sum of its proper divisors (1).

205246813 is an equidigital number, since it uses as much as digits as its factorization.

205246813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 205246813 is about 14326.4375543957. The cubic root of 205246813 is about 589.8733933068.

The spelling of 205246813 in words is "two hundred five million, two hundred forty-six thousand, eight hundred thirteen".