1263361609 has 2 divisors, whose sum is σ = 1263361610. Its totient is φ = 1263361608.

The previous prime is 1263361553. The next prime is 1263361679. The reversal of 1263361609 is 9061633621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1178205625 + 85155984 = 34325^2 + 9228^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263361609 - 2¹³ = 1263353417 is a prime.

It is not a weakly prime, because it can be changed into another prime (1263361679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631680804 + 631680805.

It is an arithmetic number, because the mean of its divisors is an integer number (631680805).

Almost surely, 2^1263361609 is an apocalyptic number.

It is an amenable number.

1263361609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263361609 is an equidigital number, since it uses as much as digits as its factorization.

1263361609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 1263361609 is about 35543.7984604910. The cubic root of 1263361609 is about 1081.0419782066.

The spelling of 1263361609 in words is "one billion, two hundred sixty-three million, three hundred sixty-one thousand, six hundred nine".