123032561 has 2 divisors, whose sum is σ = 123032562. Its totient is φ = 123032560.

The previous prime is 123032549. The next prime is 123032593. The reversal of 123032561 is 165230321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81558961 + 41473600 = 9031^2 + 6440^2 .

It is a cyclic number.

It is not a de Polignac number, because 123032561 - 2²⁶ = 55923697 is a prime.

It is a super-2 number, since 2×123032561² = 30274022132437442, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (123032501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61516280 + 61516281.

It is an arithmetic number, because the mean of its divisors is an integer number (61516281).

Almost surely, 2^123032561 is an apocalyptic number.

It is an amenable number.

123032561 is a deficient number, since it is larger than the sum of its proper divisors (1).

123032561 is an equidigital number, since it uses as much as digits as its factorization.

123032561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 123032561 is about 11092.0043725199. The cubic root of 123032561 is about 497.3628634751.

Adding to 123032561 its reverse (165230321), we get a palindrome (288262882).

The spelling of 123032561 in words is "one hundred twenty-three million, thirty-two thousand, five hundred sixty-one".