1263661907 has 2 divisors, whose sum is σ = 1263661908. Its totient is φ = 1263661906.

The previous prime is 1263661891. The next prime is 1263661951. The reversal of 1263661907 is 7091663621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1263661907 - 2⁴ = 1263661891 is a prime.

It is not a weakly prime, because it can be changed into another prime (1263661967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631830953 + 631830954.

It is an arithmetic number, because the mean of its divisors is an integer number (631830954).

Almost surely, 2^1263661907 is an apocalyptic number.

1263661907 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263661907 is an equidigital number, since it uses as much as digits as its factorization.

1263661907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 1263661907 is about 35548.0225469716. The cubic root of 1263661907 is about 1081.1276251091.

The spelling of 1263661907 in words is "one billion, two hundred sixty-three million, six hundred sixty-one thousand, nine hundred seven".