102688849 has 2 divisors, whose sum is σ = 102688850. Its totient is φ = 102688848.

The previous prime is 102688829. The next prime is 102688871. The reversal of 102688849 is 948886201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58798224 + 43890625 = 7668^2 + 6625^2 .

It is a cyclic number.

It is not a de Polignac number, because 102688849 - 2²¹ = 100591697 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102688799 and 102688808.

It is not a weakly prime, because it can be changed into another prime (102688829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51344424 + 51344425.

It is an arithmetic number, because the mean of its divisors is an integer number (51344425).

Almost surely, 2^102688849 is an apocalyptic number.

It is an amenable number.

102688849 is a deficient number, since it is larger than the sum of its proper divisors (1).

102688849 is an equidigital number, since it uses as much as digits as its factorization.

102688849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 221184, while the sum is 46.

The square root of 102688849 is about 10133.5506610467. The cubic root of 102688849 is about 468.2823207680.

The spelling of 102688849 in words is "one hundred two million, six hundred eighty-eight thousand, eight hundred forty-nine".