1641589 has 2 divisors, whose sum is σ = 1641590. Its totient is φ = 1641588.

The previous prime is 1641587. The next prime is 1641593. The reversal of 1641589 is 9851461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1575025 + 66564 = 1255^2 + 258^2 .

It is an emirp because it is prime and its reverse (9851461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1641589 - 2¹ = 1641587 is a prime.

It is a super-3 number, since 3×1641589³ = 13271333249470258407, which contains 333 as substring.

Together with 1641587, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820794 + 820795.

It is an arithmetic number, because the mean of its divisors is an integer number (820795).

2^1641589 is an apocalyptic number.

It is an amenable number.

1641589 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641589 is an equidigital number, since it uses as much as digits as its factorization.

1641589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 34.

The square root of 1641589 is about 1281.2450975516. The cubic root of 1641589 is about 117.9654452110.

The spelling of 1641589 in words is "one million, six hundred forty-one thousand, five hundred eighty-nine".