1906878786091 has 2 divisors, whose sum is σ = 1906878786092. Its totient is φ = 1906878786090.

The previous prime is 1906878786089. The next prime is 1906878786143.

1906878786091 is nontrivially palindromic in base 10.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1906878786091 - 2¹ = 1906878786089 is a prime.

Together with 1906878786089, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1906878786091.

It is not a weakly prime, because it can be changed into another prime (1906878786691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 953439393045 + 953439393046.

It is an arithmetic number, because the mean of its divisors is an integer number (953439393046).

Almost surely, 2^{1906878786091} is an apocalyptic number.

1906878786091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1906878786091 is an equidigital number, since it uses as much as digits as its factorization.

1906878786091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 73156608, while the sum is 70.

The spelling of 1906878786091 in words is "one trillion, nine hundred six billion, eight hundred seventy-eight million, seven hundred eighty-six thousand, ninety-one".