2001999997 has 2 divisors, whose sum is σ = 2001999998. Its totient is φ = 2001999996.

The previous prime is 2001999953. The next prime is 2002000027. The reversal of 2001999997 is 7999991002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1538286841 + 463713156 = 39221^2 + 21534^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001999997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001993997) 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, 1000999998 + 1000999999.

It is an arithmetic number, because the mean of its divisors is an integer number (1000999999).

Almost surely, 2^2001999997 is an apocalyptic number.

It is an amenable number.

2001999997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001999997 is an equidigital number, since it uses as much as digits as its factorization.

2001999997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 826686, while the sum is 55.

The square root of 2001999997 is about 44743.7146088699. The cubic root of 2001999997 is about 1260.3408830351.

The spelling of 2001999997 in words is "two billion, one million, nine hundred ninety-nine thousand, nine hundred ninety-seven".