1201201212091 has 2 divisors, whose sum is σ = 1201201212092. Its totient is φ = 1201201212090.

The previous prime is 1201201212077. The next prime is 1201201212179. The reversal of 1201201212091 is 1902121021021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1201201212091 - 2⁹ = 1201201211579 is a prime.

It is not a weakly prime, because it can be changed into another prime (1201201212191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600600606045 + 600600606046.

It is an arithmetic number, because the mean of its divisors is an integer number (600600606046).

Almost surely, 2^{1201201212091} is an apocalyptic number.

1201201212091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201201212091 is an equidigital number, since it uses as much as digits as its factorization.

1201201212091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 1201201212091 in words is "one trillion, two hundred one billion, two hundred one million, two hundred twelve thousand, ninety-one".