1997342161 has 2 divisors, whose sum is σ = 1997342162. Its totient is φ = 1997342160.

The previous prime is 1997342147. The next prime is 1997342203. The reversal of 1997342161 is 1612437991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1563411600 + 433930561 = 39540^2 + 20831^2 .

It is an emirp because it is prime and its reverse (1612437991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1997342161 - 2¹³ = 1997333969 is a prime.

It is not a weakly prime, because it can be changed into another prime (1997342261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998671080 + 998671081.

It is an arithmetic number, because the mean of its divisors is an integer number (998671081).

Almost surely, 2^1997342161 is an apocalyptic number.

It is an amenable number.

1997342161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997342161 is an equidigital number, since it uses as much as digits as its factorization.

1997342161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 43.

The square root of 1997342161 is about 44691.6341276530. The cubic root of 1997342161 is about 1259.3626912667.

The spelling of 1997342161 in words is "one billion, nine hundred ninety-seven million, three hundred forty-two thousand, one hundred sixty-one".