1643141 has 2 divisors, whose sum is σ = 1643142. Its totient is φ = 1643140.

The previous prime is 1643137. The next prime is 1643171. The reversal of 1643141 is 1413461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 894916 + 748225 = 946^2 + 865^2 .

It is a cyclic number.

It is not a de Polignac number, because 1643141 - 2² = 1643137 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1643171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821570 + 821571.

It is an arithmetic number, because the mean of its divisors is an integer number (821571).

2^1643141 is an apocalyptic number.

It is an amenable number.

1643141 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643141 is an equidigital number, since it uses as much as digits as its factorization.

1643141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 20.

The square root of 1643141 is about 1281.8506153215. The cubic root of 1643141 is about 118.0026093457.

The spelling of 1643141 in words is "one million, six hundred forty-three thousand, one hundred forty-one".