561829123 has 2 divisors, whose sum is σ = 561829124. Its totient is φ = 561829122.

The previous prime is 561829111. The next prime is 561829129. The reversal of 561829123 is 321928165.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561829123 is a prime.

It is not a weakly prime, because it can be changed into another prime (561829129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280914561 + 280914562.

It is an arithmetic number, because the mean of its divisors is an integer number (280914562).

Almost surely, 2^561829123 is an apocalyptic number.

561829123 is a deficient number, since it is larger than the sum of its proper divisors (1).

561829123 is an equidigital number, since it uses as much as digits as its factorization.

561829123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 561829123 is about 23702.9349026655. The cubic root of 561829123 is about 825.1535058098.

The spelling of 561829123 in words is "five hundred sixty-one million, eight hundred twenty-nine thousand, one hundred twenty-three".