1641559 has 2 divisors, whose sum is σ = 1641560. Its totient is φ = 1641558.

The previous prime is 1641539. The next prime is 1641583. The reversal of 1641559 is 9551461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1641559 - 2¹¹ = 1639511 is a prime.

1641559 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1641559.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820779 + 820780.

It is an arithmetic number, because the mean of its divisors is an integer number (820780).

2^1641559 is an apocalyptic number.

1641559 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641559 is an equidigital number, since it uses as much as digits as its factorization.

1641559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 31.

The square root of 1641559 is about 1281.2333901362. The cubic root of 1641559 is about 117.9647266014.

The spelling of 1641559 in words is "one million, six hundred forty-one thousand, five hundred fifty-nine".