1206136769 has 2 divisors, whose sum is σ = 1206136770. Its totient is φ = 1206136768.

The previous prime is 1206136751. The next prime is 1206136783. The reversal of 1206136769 is 9676316021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 905287744 + 300849025 = 30088^2 + 17345^2 .

It is an emirp because it is prime and its reverse (9676316021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1206136769 - 2²⁰ = 1205088193 is a prime.

It is a super-2 number, since 2×1206136769² = 2909531811067518722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1206136069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 603068384 + 603068385.

It is an arithmetic number, because the mean of its divisors is an integer number (603068385).

Almost surely, 2^1206136769 is an apocalyptic number.

It is an amenable number.

1206136769 is a deficient number, since it is larger than the sum of its proper divisors (1).

1206136769 is an equidigital number, since it uses as much as digits as its factorization.

1206136769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 1206136769 is about 34729.4798262226. The cubic root of 1206136769 is about 1064.4669594801.

The spelling of 1206136769 in words is "one billion, two hundred six million, one hundred thirty-six thousand, seven hundred sixty-nine".