1263243601 has 2 divisors, whose sum is σ = 1263243602. Its totient is φ = 1263243600.

The previous prime is 1263243563. The next prime is 1263243613. The reversal of 1263243601 is 1063423621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1223250625 + 39992976 = 34975^2 + 6324^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263243601 - 2¹³ = 1263235409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1263243601.

It is not a weakly prime, because it can be changed into another prime (1263243001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631621800 + 631621801.

It is an arithmetic number, because the mean of its divisors is an integer number (631621801).

Almost surely, 2^1263243601 is an apocalyptic number.

It is an amenable number.

1263243601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263243601 is an equidigital number, since it uses as much as digits as its factorization.

1263243601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 1263243601 is about 35542.1383853026. The cubic root of 1263243601 is about 1081.0083178586.

The spelling of 1263243601 in words is "one billion, two hundred sixty-three million, two hundred forty-three thousand, six hundred one".