1205909546749 has 2 divisors, whose sum is σ = 1205909546750. Its totient is φ = 1205909546748.

The previous prime is 1205909546687. The next prime is 1205909546759. The reversal of 1205909546749 is 9476459095021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1126608170724 + 79301376025 = 1061418^2 + 281605^2 .

It is a cyclic number.

It is not a de Polignac number, because 1205909546749 - 2¹³ = 1205909538557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1205909546759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602954773374 + 602954773375.

It is an arithmetic number, because the mean of its divisors is an integer number (602954773375).

Almost surely, 2^{1205909546749} is an apocalyptic number.

It is an amenable number.

1205909546749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205909546749 is an equidigital number, since it uses as much as digits as its factorization.

1205909546749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24494400, while the sum is 61.

The spelling of 1205909546749 in words is "one trillion, two hundred five billion, nine hundred nine million, five hundred forty-six thousand, seven hundred forty-nine".