1716991 has 2 divisors, whose sum is σ = 1716992. Its totient is φ = 1716990.

The previous prime is 1716971. The next prime is 1717007. The reversal of 1716991 is 1996171.

It is a strong prime.

It is an emirp because it is prime and its reverse (1996171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1716991 - 2¹³ = 1708799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1716901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 858495 + 858496.

It is an arithmetic number, because the mean of its divisors is an integer number (858496).

2^1716991 is an apocalyptic number.

1716991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1716991 is an equidigital number, since it uses as much as digits as its factorization.

1716991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3402, while the sum is 34.

The square root of 1716991 is about 1310.3400322054. The cubic root of 1716991 is about 119.7446189268.

The spelling of 1716991 in words is "one million, seven hundred sixteen thousand, nine hundred ninety-one".