82218457 has 2 divisors, whose sum is σ = 82218458. Its totient is φ = 82218456.

The previous prime is 82218449. The next prime is 82218503. The reversal of 82218457 is 75481228.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81342361 + 876096 = 9019^2 + 936^2 .

It is a cyclic number.

It is not a de Polignac number, because 82218457 - 2³ = 82218449 is a prime.

It is not a weakly prime, because it can be changed into another prime (82218427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41109228 + 41109229.

It is an arithmetic number, because the mean of its divisors is an integer number (41109229).

Almost surely, 2^82218457 is an apocalyptic number.

It is an amenable number.

82218457 is a deficient number, since it is larger than the sum of its proper divisors (1).

82218457 is an equidigital number, since it uses as much as digits as its factorization.

82218457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35840, while the sum is 37.

The square root of 82218457 is about 9067.4393849642. The cubic root of 82218457 is about 434.8336123237.

The spelling of 82218457 in words is "eighty-two million, two hundred eighteen thousand, four hundred fifty-seven".