1916641 has 2 divisors, whose sum is σ = 1916642. Its totient is φ = 1916640.

The previous prime is 1916633. The next prime is 1916647. The reversal of 1916641 is 1466191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1700416 + 216225 = 1304^2 + 465^2 .

It is an emirp because it is prime and its reverse (1466191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1916641 - 2³ = 1916633 is a prime.

It is not a weakly prime, because it can be changed into another prime (1916647) 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, 958320 + 958321.

It is an arithmetic number, because the mean of its divisors is an integer number (958321).

2^1916641 is an apocalyptic number.

It is an amenable number.

1916641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1916641 is an equidigital number, since it uses as much as digits as its factorization.

1916641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 28.

The square root of 1916641 is about 1384.4280407446. The cubic root of 1916641 is about 124.2167774155.

The spelling of 1916641 in words is "one million, nine hundred sixteen thousand, six hundred forty-one".