1922621 has 2 divisors, whose sum is σ = 1922622. Its totient is φ = 1922620.

The previous prime is 1922611. The next prime is 1922663. The reversal of 1922621 is 1262291.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1452025 + 470596 = 1205^2 + 686^2 .

It is an emirp because it is prime and its reverse (1262291) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1922621 - 2¹⁴ = 1906237 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 (1922611) 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, 961310 + 961311.

It is an arithmetic number, because the mean of its divisors is an integer number (961311).

2^1922621 is an apocalyptic number.

It is an amenable number.

1922621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1922621 is an equidigital number, since it uses as much as digits as its factorization.

1922621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 23.

The square root of 1922621 is about 1386.5860954156. The cubic root of 1922621 is about 124.3458304699.

The spelling of 1922621 in words is "one million, nine hundred twenty-two thousand, six hundred twenty-one".