84712217 has 2 divisors, whose sum is σ = 84712218. Its totient is φ = 84712216.

The previous prime is 84712211. The next prime is 84712231. The reversal of 84712217 is 71221748.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83704201 + 1008016 = 9149^2 + 1004^2 .

It is a cyclic number.

It is not a de Polignac number, because 84712217 - 2¹⁸ = 84450073 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84712211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42356108 + 42356109.

It is an arithmetic number, because the mean of its divisors is an integer number (42356109).

Almost surely, 2^84712217 is an apocalyptic number.

It is an amenable number.

84712217 is a deficient number, since it is larger than the sum of its proper divisors (1).

84712217 is an equidigital number, since it uses as much as digits as its factorization.

84712217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6272, while the sum is 32.

The square root of 84712217 is about 9203.9240001208. The cubic root of 84712217 is about 439.1861972038.

The spelling of 84712217 in words is "eighty-four million, seven hundred twelve thousand, two hundred seventeen".