1921247 has 2 divisors, whose sum is σ = 1921248. Its totient is φ = 1921246.

The previous prime is 1921229. The next prime is 1921253. The reversal of 1921247 is 7421291.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1921247 - 2⁸ = 1920991 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 (1921267) 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, 960623 + 960624.

It is an arithmetic number, because the mean of its divisors is an integer number (960624).

2^1921247 is an apocalyptic number.

1921247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921247 is an equidigital number, since it uses as much as digits as its factorization.

1921247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 26.

The square root of 1921247 is about 1386.0905453829. The cubic root of 1921247 is about 124.3162021853.

The spelling of 1921247 in words is "one million, nine hundred twenty-one thousand, two hundred forty-seven".