1171217639 has 2 divisors, whose sum is σ = 1171217640. Its totient is φ = 1171217638.

The previous prime is 1171217563. The next prime is 1171217689. The reversal of 1171217639 is 9367121711.

It is a strong prime.

It is an emirp because it is prime and its reverse (9367121711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1171217639 - 2²⁴ = 1154440423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1171217689) 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, 585608819 + 585608820.

It is an arithmetic number, because the mean of its divisors is an integer number (585608820).

Almost surely, 2^1171217639 is an apocalyptic number.

1171217639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1171217639 is an equidigital number, since it uses as much as digits as its factorization.

1171217639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15876, while the sum is 38.

The square root of 1171217639 is about 34223.0571252774. The cubic root of 1171217639 is about 1054.0936606251.

The spelling of 1171217639 in words is "one billion, one hundred seventy-one million, two hundred seventeen thousand, six hundred thirty-nine".