1263583813 has 2 divisors, whose sum is σ = 1263583814. Its totient is φ = 1263583812.

The previous prime is 1263583799. The next prime is 1263583903. The reversal of 1263583813 is 3183853621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1098127044 + 165456769 = 33138^2 + 12863^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263583813 - 2²¹ = 1261486661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1263583213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631791906 + 631791907.

It is an arithmetic number, because the mean of its divisors is an integer number (631791907).

Almost surely, 2^1263583813 is an apocalyptic number.

It is an amenable number.

1263583813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263583813 is an equidigital number, since it uses as much as digits as its factorization.

1263583813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 40.

The square root of 1263583813 is about 35546.9241004056. The cubic root of 1263583813 is about 1081.1053535085.

The spelling of 1263583813 in words is "one billion, two hundred sixty-three million, five hundred eighty-three thousand, eight hundred thirteen".