1205747511989 has 2 divisors, whose sum is σ = 1205747511990. Its totient is φ = 1205747511988.

The previous prime is 1205747511967. The next prime is 1205747512003. The reversal of 1205747511989 is 9891157475021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 762801358225 + 442946153764 = 873385^2 + 665542^2 .

It is a cyclic number.

It is not a de Polignac number, because 1205747511989 - 2²⁴ = 1205730734773 is a prime.

It is a super-2 number, since 2×1205747511989² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1205747511949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602873755994 + 602873755995.

It is an arithmetic number, because the mean of its divisors is an integer number (602873755995).

Almost surely, 2^{1205747511989} is an apocalyptic number.

It is an amenable number.

1205747511989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205747511989 is an equidigital number, since it uses as much as digits as its factorization.

1205747511989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6350400, while the sum is 59.

The spelling of 1205747511989 in words is "one trillion, two hundred five billion, seven hundred forty-seven million, five hundred eleven thousand, nine hundred eighty-nine".