1730478121 has 2 divisors, whose sum is σ = 1730478122. Its totient is φ = 1730478120.

The previous prime is 1730478119. The next prime is 1730478149. The reversal of 1730478121 is 1218740371.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1579188121 + 151290000 = 39739^2 + 12300^2 .

It is an emirp because it is prime and its reverse (1218740371) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1730478121 - 2¹ = 1730478119 is a prime.

Together with 1730478119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1730478221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 865239060 + 865239061.

It is an arithmetic number, because the mean of its divisors is an integer number (865239061).

Almost surely, 2^1730478121 is an apocalyptic number.

It is an amenable number.

1730478121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1730478121 is an equidigital number, since it uses as much as digits as its factorization.

1730478121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 1730478121 is about 41599.0158657630. The cubic root of 1730478121 is about 1200.5733651204.

The spelling of 1730478121 in words is "one billion, seven hundred thirty million, four hundred seventy-eight thousand, one hundred twenty-one".