123521525 has 12 divisors (see below), whose sum is σ = 154575300. Its totient is φ = 97908480.

The previous prime is 123521509. The next prime is 123521533. The reversal of 123521525 is 525125321.

It can be written as a sum of positive squares in 6 ways, for example, as 529 + 123520996 = 23^2 + 11114^2 .

It is not a de Polignac number, because 123521525 - 2⁴ = 123521509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123521494 and 123521503.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19940 + ... + 25389.

It is an arithmetic number, because the mean of its divisors is an integer number (12881275).

Almost surely, 2^123521525 is an apocalyptic number.

It is an amenable number.

123521525 is a deficient number, since it is larger than the sum of its proper divisors (31053775).

123521525 is a wasteful number, since it uses less digits than its factorization.

123521525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45448 (or 45443 counting only the distinct ones).

The product of its digits is 3000, while the sum is 26.

The square root of 123521525 is about 11114.0237987868. The cubic root of 123521525 is about 498.0208764763.

Adding to 123521525 its reverse (525125321), we get a palindrome (648646846).

The spelling of 123521525 in words is "one hundred twenty-three million, five hundred twenty-one thousand, five hundred twenty-five".