123530521 has 2 divisors, whose sum is σ = 123530522. Its totient is φ = 123530520.

The previous prime is 123530503. The next prime is 123530543. The reversal of 123530521 is 125035321.

It is an a-pointer prime, because the next prime (123530543) can be obtained adding 123530521 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77440000 + 46090521 = 8800^2 + 6789^2 .

It is a cyclic number.

It is not a de Polignac number, because 123530521 - 2⁵ = 123530489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123530492 and 123530501.

It is not a weakly prime, because it can be changed into another prime (123530321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61765260 + 61765261.

It is an arithmetic number, because the mean of its divisors is an integer number (61765261).

Almost surely, 2^123530521 is an apocalyptic number.

It is an amenable number.

123530521 is a deficient number, since it is larger than the sum of its proper divisors (1).

123530521 is an equidigital number, since it uses as much as digits as its factorization.

123530521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 123530521 is about 11114.4285053259. The cubic root of 123530521 is about 498.0329663719.

Adding to 123530521 its reverse (125035321), we get a palindrome (248565842).

The spelling of 123530521 in words is "one hundred twenty-three million, five hundred thirty thousand, five hundred twenty-one".