201775121 has 2 divisors, whose sum is σ = 201775122. Its totient is φ = 201775120.

The previous prime is 201775061. The next prime is 201775177. The reversal of 201775121 is 121577102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166539025 + 35236096 = 12905^2 + 5936^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201775121 is a prime.

It is not a weakly prime, because it can be changed into another prime (201775181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100887560 + 100887561.

It is an arithmetic number, because the mean of its divisors is an integer number (100887561).

Almost surely, 2^201775121 is an apocalyptic number.

It is an amenable number.

201775121 is a deficient number, since it is larger than the sum of its proper divisors (1).

201775121 is an equidigital number, since it uses as much as digits as its factorization.

201775121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 980, while the sum is 26.

The square root of 201775121 is about 14204.7569848977. The cubic root of 201775121 is about 586.5286157539.

The spelling of 201775121 in words is "two hundred one million, seven hundred seventy-five thousand, one hundred twenty-one".