17420451889 has 2 divisors, whose sum is σ = 17420451890. Its totient is φ = 17420451888.

The previous prime is 17420451823. The next prime is 17420451899. The reversal of 17420451889 is 98815402471.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16645386289 + 775065600 = 129017^2 + 27840^2 .

It is an emirp because it is prime and its reverse (98815402471) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17420451889 - 2¹¹ = 17420449841 is a prime.

It is not a weakly prime, because it can be changed into another prime (17420451809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8710225944 + 8710225945.

It is an arithmetic number, because the mean of its divisors is an integer number (8710225945).

Almost surely, 2^17420451889 is an apocalyptic number.

It is an amenable number.

17420451889 is a deficient number, since it is larger than the sum of its proper divisors (1).

17420451889 is an equidigital number, since it uses as much as digits as its factorization.

17420451889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 645120, while the sum is 49.

The spelling of 17420451889 in words is "seventeen billion, four hundred twenty million, four hundred fifty-one thousand, eight hundred eighty-nine".