1968521 has 2 divisors, whose sum is σ = 1968522. Its totient is φ = 1968520.

The previous prime is 1968487. The next prime is 1968539. The reversal of 1968521 is 1258691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1836025 + 132496 = 1355^2 + 364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1968521 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1968541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984260 + 984261.

It is an arithmetic number, because the mean of its divisors is an integer number (984261).

2^1968521 is an apocalyptic number.

It is an amenable number.

1968521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1968521 is an equidigital number, since it uses as much as digits as its factorization.

1968521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 32.

The square root of 1968521 is about 1403.0399139012. The cubic root of 1968521 is about 125.3275887350.

The spelling of 1968521 in words is "one million, nine hundred sixty-eight thousand, five hundred twenty-one".