1171681639 has 2 divisors, whose sum is σ = 1171681640. Its totient is φ = 1171681638.

The previous prime is 1171681619. The next prime is 1171681691. The reversal of 1171681639 is 9361861711.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1171681639 - 2⁹ = 1171681127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1171681595 and 1171681604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1171681619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 585840819 + 585840820.

It is an arithmetic number, because the mean of its divisors is an integer number (585840820).

Almost surely, 2^1171681639 is an apocalyptic number.

1171681639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1171681639 is an equidigital number, since it uses as much as digits as its factorization.

1171681639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 43.

The square root of 1171681639 is about 34229.8355093915. The cubic root of 1171681639 is about 1054.2328419546.

The spelling of 1171681639 in words is "one billion, one hundred seventy-one million, six hundred eighty-one thousand, six hundred thirty-nine".