17971489867 has 2 divisors, whose sum is σ = 17971489868. Its totient is φ = 17971489866.

The previous prime is 17971489801. The next prime is 17971489873. The reversal of 17971489867 is 76898417971.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17971489867 is a prime.

It is not a weakly prime, because it can be changed into another prime (17971489567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8985744933 + 8985744934.

It is an arithmetic number, because the mean of its divisors is an integer number (8985744934).

Almost surely, 2^17971489867 is an apocalyptic number.

17971489867 is a deficient number, since it is larger than the sum of its proper divisors (1).

17971489867 is an equidigital number, since it uses as much as digits as its factorization.

17971489867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42674688, while the sum is 67.

The spelling of 17971489867 in words is "seventeen billion, nine hundred seventy-one million, four hundred eighty-nine thousand, eight hundred sixty-seven".