1263680729 has 2 divisors, whose sum is σ = 1263680730. Its totient is φ = 1263680728.

The previous prime is 1263680723. The next prime is 1263680741. The reversal of 1263680729 is 9270863621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1159538704 + 104142025 = 34052^2 + 10205^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263680729 - 2¹² = 1263676633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1263680729.

It is not a weakly prime, because it can be changed into another prime (1263680723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631840364 + 631840365.

It is an arithmetic number, because the mean of its divisors is an integer number (631840365).

Almost surely, 2^1263680729 is an apocalyptic number.

It is an amenable number.

1263680729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263680729 is an equidigital number, since it uses as much as digits as its factorization.

1263680729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 1263680729 is about 35548.2872864502. The cubic root of 1263680729 is about 1081.1329928115.

The spelling of 1263680729 in words is "one billion, two hundred sixty-three million, six hundred eighty thousand, seven hundred twenty-nine".