201997813 has 2 divisors, whose sum is σ = 201997814. Its totient is φ = 201997812.

The previous prime is 201997771. The next prime is 201997823. The reversal of 201997813 is 318799102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150258564 + 51739249 = 12258^2 + 7193^2 .

It is a cyclic number.

It is not a de Polignac number, because 201997813 - 2¹³ = 201989621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201997823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100998906 + 100998907.

It is an arithmetic number, because the mean of its divisors is an integer number (100998907).

Almost surely, 2^201997813 is an apocalyptic number.

It is an amenable number.

201997813 is a deficient number, since it is larger than the sum of its proper divisors (1).

201997813 is an equidigital number, since it uses as much as digits as its factorization.

201997813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 201997813 is about 14212.5934649521. The cubic root of 201997813 is about 586.7443133210.

The spelling of 201997813 in words is "two hundred one million, nine hundred ninety-seven thousand, eight hundred thirteen".