1210320091 has 2 divisors, whose sum is σ = 1210320092. Its totient is φ = 1210320090.

The previous prime is 1210320047. The next prime is 1210320101. The reversal of 1210320091 is 1900230121.

It is a strong prime.

It is an emirp because it is prime and its reverse (1900230121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1210320091 - 2⁷ = 1210319963 is a prime.

It is not a weakly prime, because it can be changed into another prime (1210360091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605160045 + 605160046.

It is an arithmetic number, because the mean of its divisors is an integer number (605160046).

Almost surely, 2^1210320091 is an apocalyptic number.

1210320091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210320091 is an equidigital number, since it uses as much as digits as its factorization.

1210320091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 1210320091 is about 34789.6549422382. The cubic root of 1210320091 is about 1065.6961925828.

The spelling of 1210320091 in words is "one billion, two hundred ten million, three hundred twenty thousand, ninety-one".