1243241915 has 24 divisors (see below), whose sum is σ = 1597031280. Its totient is φ = 926536320.

The previous prime is 1243241897. The next prime is 1243241917. The reversal of 1243241915 is 5191423421.

It is not a de Polignac number, because 1243241915 - 2¹⁰ = 1243240891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1243241917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 351737 + ... + 355253.

It is an arithmetic number, because the mean of its divisors is an integer number (66542970).

Almost surely, 2^1243241915 is an apocalyptic number.

1243241915 is a deficient number, since it is larger than the sum of its proper divisors (353789365).

1243241915 is an equidigital number, since it uses as much as digits as its factorization.

1243241915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3663 (or 3602 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 1243241915 is about 35259.6357752034. The cubic root of 1243241915 is about 1075.2725222179.

The spelling of 1243241915 in words is "one billion, two hundred forty-three million, two hundred forty-one thousand, nine hundred fifteen".