1239861671 has 2 divisors, whose sum is σ = 1239861672. Its totient is φ = 1239861670.

The previous prime is 1239861659. The next prime is 1239861673. The reversal of 1239861671 is 1761689321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1239861671 - 2¹⁸ = 1239599527 is a prime.

Together with 1239861673, 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 (1239861673) 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, 619930835 + 619930836.

It is an arithmetic number, because the mean of its divisors is an integer number (619930836).

Almost surely, 2^1239861671 is an apocalyptic number.

1239861671 is a deficient number, since it is larger than the sum of its proper divisors (1).

1239861671 is an equidigital number, since it uses as much as digits as its factorization.

1239861671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 44.

The square root of 1239861671 is about 35211.6695287230. The cubic root of 1239861671 is about 1074.2971200483.

The spelling of 1239861671 in words is "one billion, two hundred thirty-nine million, eight hundred sixty-one thousand, six hundred seventy-one".