102218551 has 2 divisors, whose sum is σ = 102218552. Its totient is φ = 102218550.

The previous prime is 102218549. The next prime is 102218573. The reversal of 102218551 is 155812201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 102218551 - 2¹ = 102218549 is a prime.

Together with 102218549, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102218581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51109275 + 51109276.

It is an arithmetic number, because the mean of its divisors is an integer number (51109276).

Almost surely, 2^102218551 is an apocalyptic number.

102218551 is a deficient number, since it is larger than the sum of its proper divisors (1).

102218551 is an equidigital number, since it uses as much as digits as its factorization.

102218551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 800, while the sum is 25.

The square root of 102218551 is about 10110.3190355201. The cubic root of 102218551 is about 467.5663413531.

The spelling of 102218551 in words is "one hundred two million, two hundred eighteen thousand, five hundred fifty-one".