2091623 has 2 divisors, whose sum is σ = 2091624. Its totient is φ = 2091622.

The previous prime is 2091619. The next prime is 2091631. The reversal of 2091623 is 3261902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2091623 - 2² = 2091619 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2091613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1045811 + 1045812.

It is an arithmetic number, because the mean of its divisors is an integer number (1045812).

2^2091623 is an apocalyptic number.

2091623 is a deficient number, since it is larger than the sum of its proper divisors (1).

2091623 is an equidigital number, since it uses as much as digits as its factorization.

2091623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 2091623 is about 1446.2444468346. The cubic root of 2091623 is about 127.8874132065.

The spelling of 2091623 in words is "two million, ninety-one thousand, six hundred twenty-three".