201917129 has 2 divisors, whose sum is σ = 201917130. Its totient is φ = 201917128.

The previous prime is 201917117. The next prime is 201917189. The reversal of 201917129 is 921719102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149499529 + 52417600 = 12227^2 + 7240^2 .

It is a cyclic number.

It is not a de Polignac number, because 201917129 - 2⁸ = 201916873 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 201917095 and 201917104.

It is not a weakly prime, because it can be changed into another prime (201917189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100958564 + 100958565.

It is an arithmetic number, because the mean of its divisors is an integer number (100958565).

Almost surely, 2^201917129 is an apocalyptic number.

It is an amenable number.

201917129 is a deficient number, since it is larger than the sum of its proper divisors (1).

201917129 is an equidigital number, since it uses as much as digits as its factorization.

201917129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 32.

The square root of 201917129 is about 14209.7547128724. The cubic root of 201917129 is about 586.6661818106. Note that the first 3 decimals are identical.

The spelling of 201917129 in words is "two hundred one million, nine hundred seventeen thousand, one hundred twenty-nine".