1220001091 has 2 divisors, whose sum is σ = 1220001092. Its totient is φ = 1220001090.

The previous prime is 1220001089. The next prime is 1220001109. The reversal of 1220001091 is 1901000221.

Together with next prime (1220001109) 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 1220001091 - 2¹ = 1220001089 is a prime.

Together with 1220001089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1220001061) 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, 610000545 + 610000546.

It is an arithmetic number, because the mean of its divisors is an integer number (610000546).

Almost surely, 2^1220001091 is an apocalyptic number.

1220001091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220001091 is an equidigital number, since it uses as much as digits as its factorization.

1220001091 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 16.

The square root of 1220001091 is about 34928.5140107620. The cubic root of 1220001091 is about 1068.5300486641.

The spelling of 1220001091 in words is "one billion, two hundred twenty million, one thousand, ninety-one".