1263661967 has 2 divisors, whose sum is σ = 1263661968. Its totient is φ = 1263661966.

The previous prime is 1263661951. The next prime is 1263661991. The reversal of 1263661967 is 7691663621.

It is a weak prime.

It is an emirp because it is prime and its reverse (7691663621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1263661967 - 2⁴ = 1263661951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1263661907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631830983 + 631830984.

It is an arithmetic number, because the mean of its divisors is an integer number (631830984).

Almost surely, 2^1263661967 is an apocalyptic number.

1263661967 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263661967 is an equidigital number, since it uses as much as digits as its factorization.

1263661967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 47.

The square root of 1263661967 is about 35548.0233909004. The cubic root of 1263661967 is about 1081.1276422201.

The spelling of 1263661967 in words is "one billion, two hundred sixty-three million, six hundred sixty-one thousand, nine hundred sixty-seven".