205961011213 has 2 divisors, whose sum is σ = 205961011214. Its totient is φ = 205961011212.

The previous prime is 205961011171. The next prime is 205961011219. The reversal of 205961011213 is 312110169502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113931901444 + 92029109769 = 337538^2 + 303363^2 .

It is a cyclic number.

It is not a de Polignac number, because 205961011213 - 2³³ = 197371076621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (205961011219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102980505606 + 102980505607.

It is an arithmetic number, because the mean of its divisors is an integer number (102980505607).

Almost surely, 2^205961011213 is an apocalyptic number.

It is an amenable number.

205961011213 is a deficient number, since it is larger than the sum of its proper divisors (1).

205961011213 is an equidigital number, since it uses as much as digits as its factorization.

205961011213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 31.

The spelling of 205961011213 in words is "two hundred five billion, nine hundred sixty-one million, eleven thousand, two hundred thirteen".