1171255643 has 2 divisors, whose sum is σ = 1171255644. Its totient is φ = 1171255642.

The previous prime is 1171255633. The next prime is 1171255699. The reversal of 1171255643 is 3465521711.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1171255643 - 2²⁰ = 1170207067 is a prime.

It is not a weakly prime, because it can be changed into another prime (1171255633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 585627821 + 585627822.

It is an arithmetic number, because the mean of its divisors is an integer number (585627822).

Almost surely, 2^1171255643 is an apocalyptic number.

1171255643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1171255643 is an equidigital number, since it uses as much as digits as its factorization.

1171255643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 35.

The square root of 1171255643 is about 34223.6123604742. The cubic root of 1171255643 is about 1054.1050616779.

The spelling of 1171255643 in words is "one billion, one hundred seventy-one million, two hundred fifty-five thousand, six hundred forty-three".