17891320039 has 2 divisors, whose sum is σ = 17891320040. Its totient is φ = 17891320038.

The previous prime is 17891320021. The next prime is 17891320099. The reversal of 17891320039 is 93002319871.

It is a weak prime.

It is an emirp because it is prime and its reverse (93002319871) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17891320039 - 2¹¹ = 17891317991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 17891319977 and 17891320004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17891320099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8945660019 + 8945660020.

It is an arithmetic number, because the mean of its divisors is an integer number (8945660020).

Almost surely, 2^17891320039 is an apocalyptic number.

17891320039 is a deficient number, since it is larger than the sum of its proper divisors (1).

17891320039 is an equidigital number, since it uses as much as digits as its factorization.

17891320039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 43.

The spelling of 17891320039 in words is "seventeen billion, eight hundred ninety-one million, three hundred twenty thousand, thirty-nine".