1219169249 has 2 divisors, whose sum is σ = 1219169250. Its totient is φ = 1219169248.

The previous prime is 1219169243. The next prime is 1219169291. The reversal of 1219169249 is 9429619121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1159879249 + 59290000 = 34057^2 + 7700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1219169249 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 (1219169243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609584624 + 609584625.

It is an arithmetic number, because the mean of its divisors is an integer number (609584625).

Almost surely, 2^1219169249 is an apocalyptic number.

It is an amenable number.

1219169249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1219169249 is an equidigital number, since it uses as much as digits as its factorization.

1219169249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 44.

The square root of 1219169249 is about 34916.6042020125. The cubic root of 1219169249 is about 1068.2871389726.

The spelling of 1219169249 in words is "one billion, two hundred nineteen million, one hundred sixty-nine thousand, two hundred forty-nine".