201000001997 has 2 divisors, whose sum is σ = 201000001998. Its totient is φ = 201000001996.

The previous prime is 201000001967. The next prime is 201000002003. The reversal of 201000001997 is 799100000102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107152130281 + 93847871716 = 327341^2 + 306346^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201000001997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201000001967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100500000998 + 100500000999.

It is an arithmetic number, because the mean of its divisors is an integer number (100500000999).

Almost surely, 2^201000001997 is an apocalyptic number.

It is an amenable number.

201000001997 is a deficient number, since it is larger than the sum of its proper divisors (1).

201000001997 is an equidigital number, since it uses as much as digits as its factorization.

201000001997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134, while the sum is 29.

The spelling of 201000001997 in words is "two hundred one billion, one thousand, nine hundred ninety-seven".