561123331 has 2 divisors, whose sum is σ = 561123332. Its totient is φ = 561123330.

The previous prime is 561123319. The next prime is 561123359. The reversal of 561123331 is 133321165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561123331 - 2¹⁹ = 560599043 is a prime.

It is a super-2 number, since 2×561123331² = 629718785185071122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 561123296 and 561123305.

It is not a weakly prime, because it can be changed into another prime (561123391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280561665 + 280561666.

It is an arithmetic number, because the mean of its divisors is an integer number (280561666).

Almost surely, 2^561123331 is an apocalyptic number.

561123331 is a deficient number, since it is larger than the sum of its proper divisors (1).

561123331 is an equidigital number, since it uses as much as digits as its factorization.

561123331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1620, while the sum is 25.

The square root of 561123331 is about 23688.0419410301. The cubic root of 561123331 is about 824.8078308456.

Adding to 561123331 its reverse (133321165), we get a palindrome (694444496).

The spelling of 561123331 in words is "five hundred sixty-one million, one hundred twenty-three thousand, three hundred thirty-one".