1719148721 has 2 divisors, whose sum is σ = 1719148722. Its totient is φ = 1719148720.

The previous prime is 1719148699. The next prime is 1719148733. The reversal of 1719148721 is 1278419171.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1341390625 + 377758096 = 36625^2 + 19436^2 .

It is an emirp because it is prime and its reverse (1278419171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1719148721 - 2³⁰ = 645406897 is a prime.

It is not a weakly prime, because it can be changed into another prime (1719148021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 859574360 + 859574361.

It is an arithmetic number, because the mean of its divisors is an integer number (859574361).

Almost surely, 2^1719148721 is an apocalyptic number.

It is an amenable number.

1719148721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1719148721 is an equidigital number, since it uses as much as digits as its factorization.

1719148721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 41.

The square root of 1719148721 is about 41462.6183567801. The cubic root of 1719148721 is about 1197.9475844842.

The spelling of 1719148721 in words is "one billion, seven hundred nineteen million, one hundred forty-eight thousand, seven hundred twenty-one".