1997224109 has 2 divisors, whose sum is σ = 1997224110. Its totient is φ = 1997224108.

The previous prime is 1997224091. The next prime is 1997224153. The reversal of 1997224109 is 9014227991.

Together with previous prime (1997224091) it forms an Ormiston pair, because they use the same digits, order apart.

It is an a-pointer prime, because the next prime (1997224153) can be obtained adding 1997224109 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1982208484 + 15015625 = 44522^2 + 3875^2 .

It is an emirp because it is prime and its reverse (9014227991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1997224109 - 2⁸ = 1997223853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1997224109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1997224609) 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, 998612054 + 998612055.

It is an arithmetic number, because the mean of its divisors is an integer number (998612055).

Almost surely, 2^1997224109 is an apocalyptic number.

It is an amenable number.

1997224109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997224109 is an equidigital number, since it uses as much as digits as its factorization.

1997224109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 1997224109 is about 44690.3133687827. The cubic root of 1997224109 is about 1259.3378794248.

The spelling of 1997224109 in words is "one billion, nine hundred ninety-seven million, two hundred twenty-four thousand, one hundred nine".