1243109522 has 18 divisors (see below), whose sum is σ = 1890366933. Its totient is φ = 613103152.

The previous prime is 1243109521. The next prime is 1243109551. The reversal of 1243109522 is 2259013421.

It can be written as a sum of positive squares in 2 ways, for example, as 1121647081 + 121462441 = 33491^2 + 11021^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=24931.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243109521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5335118 + ... + 5335350.

Almost surely, 2^1243109522 is an apocalyptic number.

1243109522 is a deficient number, since it is larger than the sum of its proper divisors (647257411).

1243109522 is an frugal number, since it uses more digits than its factorization.

1243109522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682 (or 342 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1243109522 is about 35257.7583235236. The cubic root of 1243109522 is about 1075.2343522241.

The spelling of 1243109522 in words is "one billion, two hundred forty-three million, one hundred nine thousand, five hundred twenty-two".