123135530 has 24 divisors (see below), whose sum is σ = 257831748. Its totient is φ = 42217728.

The previous prime is 123135527. The next prime is 123135533. The reversal of 123135530 is 35531321.

It is an interprime number because it is at equal distance from previous prime (123135527) and next prime (123135533).

It can be written as a sum of positive squares in 2 ways, for example, as 117570649 + 5564881 = 10843^2 + 2359^2 .

It is a junction number, because it is equal to n+sod(n) for n = 123135496 and 123135505.

It is not an unprimeable number, because it can be changed into a prime (123135533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 125159 + ... + 126138.

Almost surely, 2^123135530 is an apocalyptic number.

123135530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123135530 is an abundant number, since it is smaller than the sum of its proper divisors (134696218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123135530 is a wasteful number, since it uses less digits than its factorization.

123135530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251318 (or 251311 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 23.

The square root of 123135530 is about 11096.6449884639. The cubic root of 123135530 is about 497.5015765545.

Adding to 123135530 its reverse (35531321), we get a palindrome (158666851).

The spelling of 123135530 in words is "one hundred twenty-three million, one hundred thirty-five thousand, five hundred thirty".