2123791 has 2 divisors, whose sum is σ = 2123792. Its totient is φ = 2123790.

The previous prime is 2123783. The next prime is 2123831. The reversal of 2123791 is 1973212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2123791 - 2³ = 2123783 is a prime.

It is a d-powerful number, because it can be written as 2¹¹ + 1 + 2¹⁹ + 3¹³ + 7⁴ + 9³ + 1 .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2123701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061895 + 1061896.

It is an arithmetic number, because the mean of its divisors is an integer number (1061896).

2^2123791 is an apocalyptic number.

2123791 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123791 is an equidigital number, since it uses as much as digits as its factorization.

2123791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 756, while the sum is 25.

The square root of 2123791 is about 1457.3232311330. The cubic root of 2123791 is about 128.5396931080.

The spelling of 2123791 in words is "two million, one hundred twenty-three thousand, seven hundred ninety-one".