1700921 has 2 divisors, whose sum is σ = 1700922. Its totient is φ = 1700920.

The previous prime is 1700917. The next prime is 1700981. The reversal of 1700921 is 1290071.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1488400 + 212521 = 1220^2 + 461^2 .

It is a cyclic number.

It is not a de Polignac number, because 1700921 - 2² = 1700917 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1700893 and 1700902.

It is not a weakly prime, because it can be changed into another prime (1700981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 850460 + 850461.

It is an arithmetic number, because the mean of its divisors is an integer number (850461).

2^1700921 is an apocalyptic number.

It is an amenable number.

1700921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1700921 is an equidigital number, since it uses as much as digits as its factorization.

1700921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 1700921 is about 1304.1936205947. The cubic root of 1700921 is about 119.3698682041.

Adding to 1700921 its reverse (1290071), we get a palindrome (2990992).

The spelling of 1700921 in words is "one million, seven hundred thousand, nine hundred twenty-one".