1205747511949 has 2 divisors, whose sum is σ = 1205747511950. Its totient is φ = 1205747511948.

The previous prime is 1205747511923. The next prime is 1205747511967. The reversal of 1205747511949 is 9491157475021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1099389996324 + 106357515625 = 1048518^2 + 326125^2 .

It is a cyclic number.

It is not a de Polignac number, because 1205747511949 - 2³⁵ = 1171387773581 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1205747511949.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1205747511989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602873755974 + 602873755975.

It is an arithmetic number, because the mean of its divisors is an integer number (602873755975).

Almost surely, 2^{1205747511949} is an apocalyptic number.

It is an amenable number.

1205747511949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205747511949 is an equidigital number, since it uses as much as digits as its factorization.

1205747511949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3175200, while the sum is 55.

The spelling of 1205747511949 in words is "one trillion, two hundred five billion, seven hundred forty-seven million, five hundred eleven thousand, nine hundred forty-nine".