2191523 has 2 divisors, whose sum is σ = 2191524. Its totient is φ = 2191522.

The previous prime is 2191513. The next prime is 2191529. The reversal of 2191523 is 3251912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2191523 - 2⁴ = 2191507 is a prime.

It is not a weakly prime, because it can be changed into another prime (2191529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095761 + 1095762.

It is an arithmetic number, because the mean of its divisors is an integer number (1095762).

2^2191523 is an apocalyptic number.

2191523 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191523 is an equidigital number, since it uses as much as digits as its factorization.

2191523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 540, while the sum is 23.

The square root of 2191523 is about 1480.3793432766. The cubic root of 2191523 is about 129.8918824931.

The spelling of 2191523 in words is "two million, one hundred ninety-one thousand, five hundred twenty-three".