102218549 has 2 divisors, whose sum is σ = 102218550. Its totient is φ = 102218548.

The previous prime is 102218513. The next prime is 102218551. The reversal of 102218549 is 945812201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83356900 + 18861649 = 9130^2 + 4343^2 .

It is a cyclic number.

It is not a de Polignac number, because 102218549 - 2⁸ = 102218293 is a prime.

Together with 102218551, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102218579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51109274 + 51109275.

It is an arithmetic number, because the mean of its divisors is an integer number (51109275).

Almost surely, 2^102218549 is an apocalyptic number.

It is an amenable number.

102218549 is a deficient number, since it is larger than the sum of its proper divisors (1).

102218549 is an equidigital number, since it uses as much as digits as its factorization.

102218549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 102218549 is about 10110.3189366112. The cubic root of 102218549 is about 467.5663383036.

The spelling of 102218549 in words is "one hundred two million, two hundred eighteen thousand, five hundred forty-nine".