1997524212769 has 2 divisors, whose sum is σ = 1997524212770. Its totient is φ = 1997524212768.

The previous prime is 1997524212727. The next prime is 1997524212787. The reversal of 1997524212769 is 9672124257991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1494474465169 + 503049747600 = 1222487^2 + 709260^2 .

It is a cyclic number.

It is not a de Polignac number, because 1997524212769 - 2¹⁷ = 1997524081697 is a prime.

It is a super-2 number, since 2×1997524212769² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1997524212769.

It is not a weakly prime, because it can be changed into another prime (1997524312769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998762106384 + 998762106385.

It is an arithmetic number, because the mean of its divisors is an integer number (998762106385).

Almost surely, 2^{1997524212769} is an apocalyptic number.

It is an amenable number.

1997524212769 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997524212769 is an equidigital number, since it uses as much as digits as its factorization.

1997524212769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34292160, while the sum is 64.

The spelling of 1997524212769 in words is "one trillion, nine hundred ninety-seven billion, five hundred twenty-four million, two hundred twelve thousand, seven hundred sixty-nine".