1643149 has 4 divisors (see below), whose sum is σ = 1646464. Its totient is φ = 1639836.

The previous prime is 1643141. The next prime is 1643171. The reversal of 1643149 is 9413461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9413461 = 17 ⋅553733.

It is a cyclic number.

It is not a de Polignac number, because 1643149 - 2³ = 1643141 is a prime.

It is a Duffinian number.

1643149 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 747 + ... + 1960.

It is an arithmetic number, because the mean of its divisors is an integer number (411616).

2^1643149 is an apocalyptic number.

It is an amenable number.

1643149 is a deficient number, since it is larger than the sum of its proper divisors (3315).

1643149 is an equidigital number, since it uses as much as digits as its factorization.

1643149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3314.

The product of its digits is 2592, while the sum is 28.

The square root of 1643149 is about 1281.8537358061. The cubic root of 1643149 is about 118.0028008528.

The spelling of 1643149 in words is "one million, six hundred forty-three thousand, one hundred forty-nine".