1669541 has 2 divisors, whose sum is σ = 1669542. Its totient is φ = 1669540.

The previous prime is 1669537. The next prime is 1669543. The reversal of 1669541 is 1459661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1113025 + 556516 = 1055^2 + 746^2 .

It is a cyclic number.

It is not a de Polignac number, because 1669541 - 2² = 1669537 is a prime.

Together with 1669543, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1669498 and 1669507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1669543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834770 + 834771.

It is an arithmetic number, because the mean of its divisors is an integer number (834771).

2^1669541 is an apocalyptic number.

It is an amenable number.

1669541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669541 is an equidigital number, since it uses as much as digits as its factorization.

1669541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The square root of 1669541 is about 1292.1071936956. The cubic root of 1669541 is about 118.6312289853.

The spelling of 1669541 in words is "one million, six hundred sixty-nine thousand, five hundred forty-one".