1263513689 has 2 divisors, whose sum is σ = 1263513690. Its totient is φ = 1263513688.

The previous prime is 1263513649. The next prime is 1263513739. The reversal of 1263513689 is 9863153621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 883575625 + 379938064 = 29725^2 + 19492^2 .

It is an emirp because it is prime and its reverse (9863153621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1263513689 - 2²⁴ = 1246736473 is a prime.

It is not a weakly prime, because it can be changed into another prime (1263513649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631756844 + 631756845.

It is an arithmetic number, because the mean of its divisors is an integer number (631756845).

Almost surely, 2^1263513689 is an apocalyptic number.

It is an amenable number.

1263513689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263513689 is an equidigital number, since it uses as much as digits as its factorization.

1263513689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 44.

The square root of 1263513689 is about 35545.9377285225. The cubic root of 1263513689 is about 1081.0853540874.

The spelling of 1263513689 in words is "one billion, two hundred sixty-three million, five hundred thirteen thousand, six hundred eighty-nine".