102217979 has 2 divisors, whose sum is σ = 102217980. Its totient is φ = 102217978.

The previous prime is 102217963. The next prime is 102217987. The reversal of 102217979 is 979712201.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 102217979 - 2⁴ = 102217963 is a prime.

It is not a weakly prime, because it can be changed into another prime (102217909) 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, 51108989 + 51108990.

It is an arithmetic number, because the mean of its divisors is an integer number (51108990).

Almost surely, 2^102217979 is an apocalyptic number.

102217979 is a deficient number, since it is larger than the sum of its proper divisors (1).

102217979 is an equidigital number, since it uses as much as digits as its factorization.

102217979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 38.

The square root of 102217979 is about 10110.2907475502. The cubic root of 102217979 is about 467.5654692073.

The spelling of 102217979 in words is "one hundred two million, two hundred seventeen thousand, nine hundred seventy-nine".