191032408709 has 2 divisors, whose sum is σ = 191032408710. Its totient is φ = 191032408708.

The previous prime is 191032408669. The next prime is 191032408711. The reversal of 191032408709 is 907804230191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155102068900 + 35930339809 = 393830^2 + 189553^2 .

It is a cyclic number.

It is not a de Polignac number, because 191032408709 - 2²⁴ = 191015631493 is a prime.

Together with 191032408711, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191032408709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191032408799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95516204354 + 95516204355.

It is an arithmetic number, because the mean of its divisors is an integer number (95516204355).

Almost surely, 2^191032408709 is an apocalyptic number.

It is an amenable number.

191032408709 is a deficient number, since it is larger than the sum of its proper divisors (1).

191032408709 is an equidigital number, since it uses as much as digits as its factorization.

191032408709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 191032408709 in words is "one hundred ninety-one billion, thirty-two million, four hundred eight thousand, seven hundred nine".