1233243561 has 16 divisors (see below), whose sum is σ = 1796506560. Its totient is φ = 746296320.

The previous prime is 1233243553. The next prime is 1233243577. The reversal of 1233243561 is 1653423321.

It is not a de Polignac number, because 1233243561 - 2³ = 1233243553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1233243511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5556 + ... + 49973.

It is an arithmetic number, because the mean of its divisors is an integer number (112281660).

Almost surely, 2^1233243561 is an apocalyptic number.

1233243561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1233243561 is a deficient number, since it is larger than the sum of its proper divisors (563262999).

1233243561 is a wasteful number, since it uses less digits than its factorization.

1233243561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56216.

The product of its digits is 12960, while the sum is 30.

The square root of 1233243561 is about 35117.5676976638. The cubic root of 1233243561 is about 1072.3822547206.

Adding to 1233243561 its reverse (1653423321), we get a palindrome (2886666882).

The spelling of 1233243561 in words is "one billion, two hundred thirty-three million, two hundred forty-three thousand, five hundred sixty-one".