1264840169 has 2 divisors, whose sum is σ = 1264840170. Its totient is φ = 1264840168.

The previous prime is 1264840123. The next prime is 1264840189. The reversal of 1264840169 is 9610484621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1225840144 + 39000025 = 35012^2 + 6245^2 .

It is an emirp because it is prime and its reverse (9610484621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1264840169 - 2²⁸ = 996404713 is a prime.

It is a super-2 number, since 2×1264840169² = 3199641306231897122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1264840189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632420084 + 632420085.

It is an arithmetic number, because the mean of its divisors is an integer number (632420085).

Almost surely, 2^1264840169 is an apocalyptic number.

It is an amenable number.

1264840169 is a deficient number, since it is larger than the sum of its proper divisors (1).

1264840169 is an equidigital number, since it uses as much as digits as its factorization.

1264840169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 1264840169 is about 35564.5915061596. The cubic root of 1264840169 is about 1081.4635419327.

The spelling of 1264840169 in words is "one billion, two hundred sixty-four million, eight hundred forty thousand, one hundred sixty-nine".