201688129 has 2 divisors, whose sum is σ = 201688130. Its totient is φ = 201688128.

The previous prime is 201688121. The next prime is 201688141. The reversal of 201688129 is 921886102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126900225 + 74787904 = 11265^2 + 8648^2 .

It is a cyclic number.

It is not a de Polignac number, because 201688129 - 2³ = 201688121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (201688121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100844064 + 100844065.

It is an arithmetic number, because the mean of its divisors is an integer number (100844065).

Almost surely, 2^201688129 is an apocalyptic number.

It is an amenable number.

201688129 is a deficient number, since it is larger than the sum of its proper divisors (1).

201688129 is an equidigital number, since it uses as much as digits as its factorization.

201688129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 201688129 is about 14201.6945819856. The cubic root of 201688129 is about 586.4443129395. Note that the first 3 decimals are identical.

The spelling of 201688129 in words is "two hundred one million, six hundred eighty-eight thousand, one hundred twenty-nine".