17848783921 has 2 divisors, whose sum is σ = 17848783922. Its totient is φ = 17848783920.

The previous prime is 17848783919. The next prime is 17848783949. The reversal of 17848783921 is 12938784871.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16827278400 + 1021505521 = 129720^2 + 31961^2 .

It is an emirp because it is prime and its reverse (12938784871) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17848783921 - 2¹ = 17848783919 is a prime.

Together with 17848783919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (17848783951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8924391960 + 8924391961.

It is an arithmetic number, because the mean of its divisors is an integer number (8924391961).

Almost surely, 2^17848783921 is an apocalyptic number.

It is an amenable number.

17848783921 is a deficient number, since it is larger than the sum of its proper divisors (1).

17848783921 is an equidigital number, since it uses as much as digits as its factorization.

17848783921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5419008, while the sum is 58.

The spelling of 17848783921 in words is "seventeen billion, eight hundred forty-eight million, seven hundred eighty-three thousand, nine hundred twenty-one".