1171221263 has 2 divisors, whose sum is σ = 1171221264. Its totient is φ = 1171221262.

The previous prime is 1171221197. The next prime is 1171221269. The reversal of 1171221263 is 3621221711.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1171221263 - 2¹² = 1171217167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1171221269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 585610631 + 585610632.

It is an arithmetic number, because the mean of its divisors is an integer number (585610632).

Almost surely, 2^1171221263 is an apocalyptic number.

1171221263 is a deficient number, since it is larger than the sum of its proper divisors (1).

1171221263 is an equidigital number, since it uses as much as digits as its factorization.

1171221263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 26.

The square root of 1171221263 is about 34223.1100719967. The cubic root of 1171221263 is about 1054.0947478217.

Adding to 1171221263 its reverse (3621221711), we get a palindrome (4792442974).

The spelling of 1171221263 in words is "one billion, one hundred seventy-one million, two hundred twenty-one thousand, two hundred sixty-three".