201999997 has 2 divisors, whose sum is σ = 201999998. Its totient is φ = 201999996.

The previous prime is 201999991. The next prime is 202000003. The reversal of 201999997 is 799999102.

It is a balanced prime because it is at equal distance from previous prime (201999991) and next prime (202000003).

It can be written as a sum of positive squares in only one way, i.e., 105390756 + 96609241 = 10266^2 + 9829^2 .

It is a cyclic number.

It is not a de Polignac number, because 201999997 - 2²⁷ = 67782269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201999991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100999998 + 100999999.

It is an arithmetic number, because the mean of its divisors is an integer number (100999999).

Almost surely, 2^201999997 is an apocalyptic number.

It is an amenable number.

201999997 is a deficient number, since it is larger than the sum of its proper divisors (1).

201999997 is an equidigital number, since it uses as much as digits as its factorization.

201999997 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 201999997 is about 14212.6702980123. The cubic root of 201999997 is about 586.7464279396.

The spelling of 201999997 in words is "two hundred one million, nine hundred ninety-nine thousand, nine hundred ninety-seven".