17291981689 has 2 divisors, whose sum is σ = 17291981690. Its totient is φ = 17291981688.

The previous prime is 17291981683. The next prime is 17291981789. The reversal of 17291981689 is 98618919271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13399220025 + 3892761664 = 115755^2 + 62392^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17291981689 is a prime.

It is a super-2 number, since 2×17291981689² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (17291981683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8645990844 + 8645990845.

It is an arithmetic number, because the mean of its divisors is an integer number (8645990845).

Almost surely, 2^17291981689 is an apocalyptic number.

It is an amenable number.

17291981689 is a deficient number, since it is larger than the sum of its proper divisors (1).

17291981689 is an equidigital number, since it uses as much as digits as its factorization.

17291981689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 61.

The spelling of 17291981689 in words is "seventeen billion, two hundred ninety-one million, nine hundred eighty-one thousand, six hundred eighty-nine".