1694921 has 2 divisors, whose sum is σ = 1694922. Its totient is φ = 1694920.

The previous prime is 1694909. The next prime is 1694929. The reversal of 1694921 is 1294961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 929296 + 765625 = 964^2 + 875^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1694921 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (1694929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 847460 + 847461.

It is an arithmetic number, because the mean of its divisors is an integer number (847461).

2^1694921 is an apocalyptic number.

It is an amenable number.

1694921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1694921 is an equidigital number, since it uses as much as digits as its factorization.

1694921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 32.

The square root of 1694921 is about 1301.8913165084. The cubic root of 1694921 is about 119.2293437435.

The spelling of 1694921 in words is "one million, six hundred ninety-four thousand, nine hundred twenty-one".