1210210091 has 2 divisors, whose sum is σ = 1210210092. Its totient is φ = 1210210090.

The previous prime is 1210210087. The next prime is 1210210151. The reversal of 1210210091 is 1900120121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1210210091 - 2² = 1210210087 is a prime.

It is not a weakly prime, because it can be changed into another prime (1210210081) 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, 605105045 + 605105046.

It is an arithmetic number, because the mean of its divisors is an integer number (605105046).

Almost surely, 2^1210210091 is an apocalyptic number.

1210210091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210210091 is an equidigital number, since it uses as much as digits as its factorization.

1210210091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 1210210091 is about 34788.0739765800. The cubic root of 1210210091 is about 1065.6639063214.

The spelling of 1210210091 in words is "one billion, two hundred ten million, two hundred ten thousand, ninety-one".