1206121662091 has 2 divisors, whose sum is σ = 1206121662092. Its totient is φ = 1206121662090.

The previous prime is 1206121662019. The next prime is 1206121662181. The reversal of 1206121662091 is 1902661216021.

Together with previous prime (1206121662019) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1206121662091 - 2⁹ = 1206121661579 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1206121662091.

It is not a weakly prime, because it can be changed into another prime (1206121662491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 603060831045 + 603060831046.

It is an arithmetic number, because the mean of its divisors is an integer number (603060831046).

Almost surely, 2^{1206121662091} is an apocalyptic number.

1206121662091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1206121662091 is an equidigital number, since it uses as much as digits as its factorization.

1206121662091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 37.

The spelling of 1206121662091 in words is "one trillion, two hundred six billion, one hundred twenty-one million, six hundred sixty-two thousand, ninety-one".