2191659439 has 2 divisors, whose sum is σ = 2191659440. Its totient is φ = 2191659438.

The previous prime is 2191659433. The next prime is 2191659467. The reversal of 2191659439 is 9349561912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2191659439 - 2²⁵ = 2158105007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2191659392 and 2191659401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2191659433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095829719 + 1095829720.

It is an arithmetic number, because the mean of its divisors is an integer number (1095829720).

Almost surely, 2^2191659439 is an apocalyptic number.

2191659439 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191659439 is an equidigital number, since it uses as much as digits as its factorization.

2191659439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 524880, while the sum is 49.

The square root of 2191659439 is about 46815.1624903727. The cubic root of 2191659439 is about 1298.9457802352.

The spelling of 2191659439 in words is "two billion, one hundred ninety-one million, six hundred fifty-nine thousand, four hundred thirty-nine".