1921499 has 2 divisors, whose sum is σ = 1921500. Its totient is φ = 1921498.

The previous prime is 1921483. The next prime is 1921529. The reversal of 1921499 is 9941291.

It is a weak prime.

It is an emirp because it is prime and its reverse (9941291) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1921499 - 2⁴ = 1921483 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1221499) 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, 960749 + 960750.

It is an arithmetic number, because the mean of its divisors is an integer number (960750).

2^1921499 is an apocalyptic number.

1921499 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921499 is an equidigital number, since it uses as much as digits as its factorization.

1921499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 35.

The square root of 1921499 is about 1386.1814455547. The cubic root of 1921499 is about 124.3216372514.

The spelling of 1921499 in words is "one million, nine hundred twenty-one thousand, four hundred ninety-nine".