1263191 has 2 divisors, whose sum is σ = 1263192. Its totient is φ = 1263190.

The previous prime is 1263187. The next prime is 1263193. The reversal of 1263191 is 1913621.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1263191 - 2² = 1263187 is a prime.

It is a Sophie Germain prime.

Together with 1263193, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1263193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631595 + 631596.

It is an arithmetic number, because the mean of its divisors is an integer number (631596).

2^1263191 is an apocalyptic number.

1263191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263191 is an equidigital number, since it uses as much as digits as its factorization.

1263191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 23.

The square root of 1263191 is about 1123.9177016134. The cubic root of 1263191 is about 108.0993313387.

The spelling of 1263191 in words is "one million, two hundred sixty-three thousand, one hundred ninety-one".