108649189490249 has 2 divisors, whose sum is σ = 108649189490250. Its totient is φ = 108649189490248.

The previous prime is 108649189490243. The next prime is 108649189490273. The reversal of 108649189490249 is 942094981946801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102466382914624 + 6182806575625 = 10122568^2 + 2486525^2 .

It is an emirp because it is prime and its reverse (942094981946801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 108649189490249 - 2¹² = 108649189486153 is a prime.

It is not a weakly prime, because it can be changed into another prime (108649189490243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54324594745124 + 54324594745125.

It is an arithmetic number, because the mean of its divisors is an integer number (54324594745125).

Almost surely, 2^{108649189490249} is an apocalyptic number.

It is an amenable number.

108649189490249 is a deficient number, since it is larger than the sum of its proper divisors (1).

108649189490249 is an equidigital number, since it uses as much as digits as its factorization.

108649189490249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 322486272, while the sum is 74.

The spelling of 108649189490249 in words is "one hundred eight trillion, six hundred forty-nine billion, one hundred eighty-nine million, four hundred ninety thousand, two hundred forty-nine".