1720712971 has 2 divisors, whose sum is σ = 1720712972. Its totient is φ = 1720712970.

The previous prime is 1720712947. The next prime is 1720713023. The reversal of 1720712971 is 1792170271.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (1792170271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1720712971 - 2¹¹ = 1720710923 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1720712971.

It is not a weakly prime, because it can be changed into another prime (1720712771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860356485 + 860356486.

It is an arithmetic number, because the mean of its divisors is an integer number (860356486).

Almost surely, 2^1720712971 is an apocalyptic number.

1720712971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720712971 is an equidigital number, since it uses as much as digits as its factorization.

1720712971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12348, while the sum is 37.

The square root of 1720712971 is about 41481.4774447584. The cubic root of 1720712971 is about 1198.3108110478.

The spelling of 1720712971 in words is "one billion, seven hundred twenty million, seven hundred twelve thousand, nine hundred seventy-one".