109218449 has 2 divisors, whose sum is σ = 109218450. Its totient is φ = 109218448.

The previous prime is 109218433. The next prime is 109218469. The reversal of 109218449 is 944812901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92775424 + 16443025 = 9632^2 + 4055^2 .

It is an emirp because it is prime and its reverse (944812901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 109218449 - 2⁴ = 109218433 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (109218469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54609224 + 54609225.

It is an arithmetic number, because the mean of its divisors is an integer number (54609225).

Almost surely, 2^109218449 is an apocalyptic number.

It is an amenable number.

109218449 is a deficient number, since it is larger than the sum of its proper divisors (1).

109218449 is an equidigital number, since it uses as much as digits as its factorization.

109218449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 109218449 is about 10450.7630821869. The cubic root of 109218449 is about 478.0045181438.

The spelling of 109218449 in words is "one hundred nine million, two hundred eighteen thousand, four hundred forty-nine".