201009997 has 2 divisors, whose sum is σ = 201009998. Its totient is φ = 201009996.

The previous prime is 201009967. The next prime is 201010001. The reversal of 201009997 is 799900102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166564836 + 34445161 = 12906^2 + 5869^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201009997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201009917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100504998 + 100504999.

It is an arithmetic number, because the mean of its divisors is an integer number (100504999).

Almost surely, 2^201009997 is an apocalyptic number.

It is an amenable number.

201009997 is a deficient number, since it is larger than the sum of its proper divisors (1).

201009997 is an equidigital number, since it uses as much as digits as its factorization.

201009997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 201009997 is about 14177.7994413802. The cubic root of 201009997 is about 585.7863115612.

The spelling of 201009997 in words is "two hundred one million, nine thousand, nine hundred ninety-seven".