17991414281 has 2 divisors, whose sum is σ = 17991414282. Its totient is φ = 17991414280.

The previous prime is 17991414263. The next prime is 17991414373. The reversal of 17991414281 is 18241419971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9779429881 + 8211984400 = 98891^2 + 90620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17991414281 is a prime.

It is a super-2 number, since 2×17991414281² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (17991414251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8995707140 + 8995707141.

It is an arithmetic number, because the mean of its divisors is an integer number (8995707141).

Almost surely, 2^17991414281 is an apocalyptic number.

It is an amenable number.

17991414281 is a deficient number, since it is larger than the sum of its proper divisors (1).

17991414281 is an equidigital number, since it uses as much as digits as its factorization.

17991414281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 47.

The spelling of 17991414281 in words is "seventeen billion, nine hundred ninety-one million, four hundred fourteen thousand, two hundred eighty-one".