84457213 has 2 divisors, whose sum is σ = 84457214. Its totient is φ = 84457212.

The previous prime is 84457201. The next prime is 84457229. The reversal of 84457213 is 31275448.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81757764 + 2699449 = 9042^2 + 1643^2 .

It is a cyclic number.

It is not a de Polignac number, because 84457213 - 2¹³ = 84449021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84457283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42228606 + 42228607.

It is an arithmetic number, because the mean of its divisors is an integer number (42228607).

Almost surely, 2^84457213 is an apocalyptic number.

It is an amenable number.

84457213 is a deficient number, since it is larger than the sum of its proper divisors (1).

84457213 is an equidigital number, since it uses as much as digits as its factorization.

84457213 is an odious number, because the sum of its binary digits is odd.

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

The square root of 84457213 is about 9190.0605547515. The cubic root of 84457213 is about 438.7450691675.

The spelling of 84457213 in words is "eighty-four million, four hundred fifty-seven thousand, two hundred thirteen".