1243109550 has 48 divisors (see below), whose sum is σ = 3089770992. Its totient is φ = 330758400.

The previous prime is 1243109521. The next prime is 1243109551. The reversal of 1243109550 is 559013421.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243109551) 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 in 23 ways as a sum of consecutive naturals, for example, 60162 + ... + 78138.

It is an arithmetic number, because the mean of its divisors is an integer number (64370229).

Almost surely, 2^1243109550 is an apocalyptic number.

1243109550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1243109550 is an abundant number, since it is smaller than the sum of its proper divisors (1846661442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1243109550 is a wasteful number, since it uses less digits than its factorization.

1243109550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18453 (or 18448 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 1243109550 is about 35257.7587205994. The cubic root of 1243109550 is about 1075.2343602970.

The spelling of 1243109550 in words is "one billion, two hundred forty-three million, one hundred nine thousand, five hundred fifty".