71712217 has 2 divisors, whose sum is σ = 71712218. Its totient is φ = 71712216.

The previous prime is 71712209. The next prime is 71712241. The reversal of 71712217 is 71221717.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71166096 + 546121 = 8436^2 + 739^2 .

It is a cyclic number.

It is not a de Polignac number, because 71712217 - 2³ = 71712209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71712257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35856108 + 35856109.

It is an arithmetic number, because the mean of its divisors is an integer number (35856109).

Almost surely, 2^71712217 is an apocalyptic number.

It is an amenable number.

71712217 is a deficient number, since it is larger than the sum of its proper divisors (1).

71712217 is an equidigital number, since it uses as much as digits as its factorization.

71712217 is an evil number, because the sum of its binary digits is even.

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

The square root of 71712217 is about 8468.3066193897. The cubic root of 71712217 is about 415.4617534182.

The spelling of 71712217 in words is "seventy-one million, seven hundred twelve thousand, two hundred seventeen".