123521533 has 2 divisors, whose sum is σ = 123521534. Its totient is φ = 123521532.

The previous prime is 123521509. The next prime is 123521537. The reversal of 123521533 is 335125321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96864964 + 26656569 = 9842^2 + 5163^2 .

It is a cyclic number.

It is not a de Polignac number, because 123521533 - 2⁵ = 123521501 is a prime.

It is a super-2 number, since 2×123521533² = 30515138229340178, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123521498 and 123521507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123521537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61760766 + 61760767.

It is an arithmetic number, because the mean of its divisors is an integer number (61760767).

Almost surely, 2^123521533 is an apocalyptic number.

It is an amenable number.

123521533 is a deficient number, since it is larger than the sum of its proper divisors (1).

123521533 is an equidigital number, since it uses as much as digits as its factorization.

123521533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2700, while the sum is 25.

The square root of 123521533 is about 11114.0241586925. The cubic root of 123521533 is about 498.0208872279.

Adding to 123521533 its reverse (335125321), we get a palindrome (458646854).

The spelling of 123521533 in words is "one hundred twenty-three million, five hundred twenty-one thousand, five hundred thirty-three".