17122981 has 2 divisors, whose sum is σ = 17122982. Its totient is φ = 17122980.

The previous prime is 17122979. The next prime is 17122991. The reversal of 17122981 is 18922171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14130081 + 2992900 = 3759^2 + 1730^2 .

It is an emirp because it is prime and its reverse (18922171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17122981 - 2¹ = 17122979 is a prime.

It is a super-2 number, since 2×17122981² = 586392956652722, which contains 22 as substring.

Together with 17122979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17122951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8561490 + 8561491.

It is an arithmetic number, because the mean of its divisors is an integer number (8561491).

Almost surely, 2^17122981 is an apocalyptic number.

It is an amenable number.

17122981 is a deficient number, since it is larger than the sum of its proper divisors (1).

17122981 is an equidigital number, since it uses as much as digits as its factorization.

17122981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 31.

The square root of 17122981 is about 4137.9923876199. The cubic root of 17122981 is about 257.7467067201.

The spelling of 17122981 in words is "seventeen million, one hundred twenty-two thousand, nine hundred eighty-one".