1243341561 has 32 divisors (see below), whose sum is σ = 2080078848. Its totient is φ = 641759040.

The previous prime is 1243341503. The next prime is 1243341569. The reversal of 1243341561 is 1651433421.

It is not a de Polignac number, because 1243341561 - 2⁶ = 1243341497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1243341569) 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 31 ways as a sum of consecutive naturals, for example, 19126 + ... + 53408.

It is an arithmetic number, because the mean of its divisors is an integer number (65002464).

Almost surely, 2^1243341561 is an apocalyptic number.

1243341561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1243341561 is a deficient number, since it is larger than the sum of its proper divisors (836737287).

1243341561 is a wasteful number, since it uses less digits than its factorization.

1243341561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34461.

The product of its digits is 8640, while the sum is 30.

The square root of 1243341561 is about 35261.0487790707. The cubic root of 1243341561 is about 1075.3012491943.

Adding to 1243341561 its reverse (1651433421), we get a palindrome (2894774982).

The spelling of 1243341561 in words is "one billion, two hundred forty-three million, three hundred forty-one thousand, five hundred sixty-one".