1263361553 has 2 divisors, whose sum is σ = 1263361554. Its totient is φ = 1263361552.

The previous prime is 1263361531. The next prime is 1263361609. The reversal of 1263361553 is 3551633621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 641507584 + 621853969 = 25328^2 + 24937^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263361553 - 2¹⁰ = 1263360529 is a prime.

It is not a weakly prime, because it can be changed into another prime (1263361153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631680776 + 631680777.

It is an arithmetic number, because the mean of its divisors is an integer number (631680777).

Almost surely, 2^1263361553 is an apocalyptic number.

It is an amenable number.

1263361553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263361553 is an equidigital number, since it uses as much as digits as its factorization.

1263361553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48600, while the sum is 35.

The square root of 1263361553 is about 35543.7976727305. The cubic root of 1263361553 is about 1081.0419622338.

The spelling of 1263361553 in words is "one billion, two hundred sixty-three million, three hundred sixty-one thousand, five hundred fifty-three".