1641091 has 2 divisors, whose sum is σ = 1641092. Its totient is φ = 1641090.

The previous prime is 1641089. The next prime is 1641103. The reversal of 1641091 is 1901461.

It is a weak prime.

It is an emirp because it is prime and its reverse (1901461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1641091 - 2¹ = 1641089 is a prime.

Together with 1641089, it forms a pair of twin primes.

It is an Ulam number.

1641091 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1681091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820545 + 820546.

It is an arithmetic number, because the mean of its divisors is an integer number (820546).

2^1641091 is an apocalyptic number.

1641091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641091 is an equidigital number, since it uses as much as digits as its factorization.

1641091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1641091 is about 1281.0507406032. The cubic root of 1641091 is about 117.9535151576.

The spelling of 1641091 in words is "one million, six hundred forty-one thousand, ninety-one".