1263199291 has 2 divisors, whose sum is σ = 1263199292. Its totient is φ = 1263199290.

The previous prime is 1263199271. The next prime is 1263199349. The reversal of 1263199291 is 1929913621.

It is a weak prime.

It is an emirp because it is prime and its reverse (1929913621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1263199291 - 2²⁷ = 1128981563 is a prime.

It is not a weakly prime, because it can be changed into another prime (1263199271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631599645 + 631599646.

It is an arithmetic number, because the mean of its divisors is an integer number (631599646).

Almost surely, 2^1263199291 is an apocalyptic number.

1263199291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263199291 is an equidigital number, since it uses as much as digits as its factorization.

1263199291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 43.

The square root of 1263199291 is about 35541.5150352373. The cubic root of 1263199291 is about 1080.9956784283.

The spelling of 1263199291 in words is "one billion, two hundred sixty-three million, one hundred ninety-nine thousand, two hundred ninety-one".