1997130101 has 2 divisors, whose sum is σ = 1997130102. Its totient is φ = 1997130100.

The previous prime is 1997130067. The next prime is 1997130119. The reversal of 1997130101 is 1010317991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1734722500 + 262407601 = 41650^2 + 16199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1997130101 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1997130001) 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, 998565050 + 998565051.

It is an arithmetic number, because the mean of its divisors is an integer number (998565051).

Almost surely, 2^1997130101 is an apocalyptic number.

It is an amenable number.

1997130101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997130101 is an equidigital number, since it uses as much as digits as its factorization.

1997130101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1701, while the sum is 32.

The square root of 1997130101 is about 44689.2615848595. The cubic root of 1997130101 is about 1259.3181203849.

The spelling of 1997130101 in words is "one billion, nine hundred ninety-seven million, one hundred thirty thousand, one hundred one".