2091659 has 2 divisors, whose sum is σ = 2091660. Its totient is φ = 2091658.

The previous prime is 2091637. The next prime is 2091667. The reversal of 2091659 is 9561902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2091659 - 2¹² = 2087563 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (2091619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1045829 + 1045830.

It is an arithmetic number, because the mean of its divisors is an integer number (1045830).

2^2091659 is an apocalyptic number.

2091659 is a deficient number, since it is larger than the sum of its proper divisors (1).

2091659 is an equidigital number, since it uses as much as digits as its factorization.

2091659 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 2091659 is about 1446.2568928098. The cubic root of 2091659 is about 127.8881469143. Note that the first 3 decimals are identical.

The spelling of 2091659 in words is "two million, ninety-one thousand, six hundred fifty-nine".