1641421 has 4 divisors (see below), whose sum is σ = 1645600. Its totient is φ = 1637244.

The previous prime is 1641407. The next prime is 1641457. The reversal of 1641421 is 1241461.

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.

It is a cyclic number.

It is not a de Polignac number, because 1641421 - 2⁵ = 1641389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1431 + ... + 2308.

It is an arithmetic number, because the mean of its divisors is an integer number (411400).

2^1641421 is an apocalyptic number.

It is an amenable number.

1641421 is a deficient number, since it is larger than the sum of its proper divisors (4179).

1641421 is an equidigital number, since it uses as much as digits as its factorization.

1641421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4178.

The product of its digits is 192, while the sum is 19.

The square root of 1641421 is about 1281.1795346477. The cubic root of 1641421 is about 117.9614208844.

Adding to 1641421 its reverse (1241461), we get a palindrome (2882882).

The spelling of 1641421 in words is "one million, six hundred forty-one thousand, four hundred twenty-one".