84206257 has 2 divisors, whose sum is σ = 84206258. Its totient is φ = 84206256.

The previous prime is 84206237. The next prime is 84206327. The reversal of 84206257 is 75260248.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62078641 + 22127616 = 7879^2 + 4704^2 .

It is a cyclic number.

It is not a de Polignac number, because 84206257 - 2²³ = 75817649 is a prime.

It is not a weakly prime, because it can be changed into another prime (84206237) 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, 42103128 + 42103129.

It is an arithmetic number, because the mean of its divisors is an integer number (42103129).

Almost surely, 2^84206257 is an apocalyptic number.

It is an amenable number.

84206257 is a deficient number, since it is larger than the sum of its proper divisors (1).

84206257 is an equidigital number, since it uses as much as digits as its factorization.

84206257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 84206257 is about 9176.3967329230. The cubic root of 84206257 is about 438.3100759522.

The spelling of 84206257 in words is "eighty-four million, two hundred six thousand, two hundred fifty-seven".