1701991 has 2 divisors, whose sum is σ = 1701992. Its totient is φ = 1701990.

The previous prime is 1701979. The next prime is 1702009. The reversal of 1701991 is 1991071.

It is a weak prime.

It is an emirp because it is prime and its reverse (1991071) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1701991 - 2¹⁵ = 1669223 is a prime.

It is an Ulam number.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1701901) 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, 850995 + 850996.

It is an arithmetic number, because the mean of its divisors is an integer number (850996).

2^1701991 is an apocalyptic number.

1701991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1701991 is an equidigital number, since it uses as much as digits as its factorization.

1701991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 567, while the sum is 28.

The square root of 1701991 is about 1304.6037712654. The cubic root of 1701991 is about 119.3948936629.

The spelling of 1701991 in words is "one million, seven hundred one thousand, nine hundred ninety-one".