201771217 has 2 divisors, whose sum is σ = 201771218. Its totient is φ = 201771216.

The previous prime is 201771211. The next prime is 201771221. The reversal of 201771217 is 712177102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192626641 + 9144576 = 13879^2 + 3024^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201771217 is a prime.

It is a super-2 number, since 2×201771217² = 81423248019322178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (201771211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100885608 + 100885609.

It is an arithmetic number, because the mean of its divisors is an integer number (100885609).

Almost surely, 2^201771217 is an apocalyptic number.

It is an amenable number.

201771217 is a deficient number, since it is larger than the sum of its proper divisors (1).

201771217 is an equidigital number, since it uses as much as digits as its factorization.

201771217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1372, while the sum is 28.

The square root of 201771217 is about 14204.6195654794. The cubic root of 201771217 is about 586.5248329577.

It can be divided in two parts, 20177121 and 7, that added together give a triangular number (20177128 = T₆₃₅₂).

The spelling of 201771217 in words is "two hundred one million, seven hundred seventy-one thousand, two hundred seventeen".