1669091 has 2 divisors, whose sum is σ = 1669092. Its totient is φ = 1669090.

The previous prime is 1669061. The next prime is 1669097. The reversal of 1669091 is 1909661.

It is a happy number.

It is a strong prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1606991 and 1996061.

It is a cyclic number.

It is not a de Polignac number, because 1669091 - 2⁶ = 1669027 is a prime.

It is not a weakly prime, because it can be changed into another prime (1669097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834545 + 834546.

It is an arithmetic number, because the mean of its divisors is an integer number (834546).

2^1669091 is an apocalyptic number.

1669091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669091 is an equidigital number, since it uses as much as digits as its factorization.

1669091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 1669091 is about 1291.9330478009. The cubic root of 1669091 is about 118.6205695985.

The spelling of 1669091 in words is "one million, six hundred sixty-nine thousand, ninety-one".