1671421 has 2 divisors, whose sum is σ = 1671422. Its totient is φ = 1671420.

The previous prime is 1671379. The next prime is 1671431. The reversal of 1671421 is 1241761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1625625 + 45796 = 1275^2 + 214^2 .

It is an emirp because it is prime and its reverse (1241761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1671421 - 2¹⁵ = 1638653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1671392 and 1671401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1671431) 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 as a sum of consecutive naturals, namely, 835710 + 835711.

It is an arithmetic number, because the mean of its divisors is an integer number (835711).

2^1671421 is an apocalyptic number.

It is an amenable number.

1671421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1671421 is an equidigital number, since it uses as much as digits as its factorization.

1671421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 336, while the sum is 22.

The square root of 1671421 is about 1292.8344828322. The cubic root of 1671421 is about 118.6757408300.

The spelling of 1671421 in words is "one million, six hundred seventy-one thousand, four hundred twenty-one".