1263293891 has 2 divisors, whose sum is σ = 1263293892. Its totient is φ = 1263293890.

The previous prime is 1263293881. The next prime is 1263293897. The reversal of 1263293891 is 1983923621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1263293891 - 2¹⁸ = 1263031747 is a prime.

It is a super-2 number, since 2×1263293891² = 3191822910075839762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1263293897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631646945 + 631646946.

It is an arithmetic number, because the mean of its divisors is an integer number (631646946).

Almost surely, 2^1263293891 is an apocalyptic number.

1263293891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263293891 is an equidigital number, since it uses as much as digits as its factorization.

1263293891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 44.

The square root of 1263293891 is about 35542.8458483560. The cubic root of 1263293891 is about 1081.0226627263.

The spelling of 1263293891 in words is "one billion, two hundred sixty-three million, two hundred ninety-three thousand, eight hundred ninety-one".