197920024109 has 2 divisors, whose sum is σ = 197920024110. Its totient is φ = 197920024108.

The previous prime is 197920024091. The next prime is 197920024147. The reversal of 197920024109 is 901420029791.

Together with previous prime (197920024091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181842544900 + 16077479209 = 426430^2 + 126797^2 .

It is a cyclic number.

It is not a de Polignac number, because 197920024109 - 2³⁶ = 129200547373 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 197920024109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197920054109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98960012054 + 98960012055.

It is an arithmetic number, because the mean of its divisors is an integer number (98960012055).

Almost surely, 2^197920024109 is an apocalyptic number.

It is an amenable number.

197920024109 is a deficient number, since it is larger than the sum of its proper divisors (1).

197920024109 is an equidigital number, since it uses as much as digits as its factorization.

197920024109 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 spelling of 197920024109 in words is "one hundred ninety-seven billion, nine hundred twenty million, twenty-four thousand, one hundred nine".