83218657 has 2 divisors, whose sum is σ = 83218658. Its totient is φ = 83218656.

The previous prime is 83218633. The next prime is 83218693. The reversal of 83218657 is 75681238.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53450721 + 29767936 = 7311^2 + 5456^2 .

It is a cyclic number.

It is not a de Polignac number, because 83218657 - 2¹⁹ = 82694369 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (83218607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41609328 + 41609329.

It is an arithmetic number, because the mean of its divisors is an integer number (41609329).

Almost surely, 2^83218657 is an apocalyptic number.

It is an amenable number.

83218657 is a deficient number, since it is larger than the sum of its proper divisors (1).

83218657 is an equidigital number, since it uses as much as digits as its factorization.

83218657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 40.

The square root of 83218657 is about 9122.4260479326. The cubic root of 83218657 is about 436.5897823834.

The spelling of 83218657 in words is "eighty-three million, two hundred eighteen thousand, six hundred fifty-seven".