123530731 has 4 divisors (see below), whose sum is σ = 123587352. Its totient is φ = 123474112.

The previous prime is 123530713. The next prime is 123530767. The reversal of 123530731 is 137035321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137035321 = 337 ⋅406633.

It is a cyclic number.

It is not a de Polignac number, because 123530731 - 2⁹ = 123530219 is a prime.

It is a super-2 number, since 2×123530731² = 30519683002788722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123530696 and 123530705.

It is not an unprimeable number, because it can be changed into a prime (123530791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24901 + ... + 29446.

It is an arithmetic number, because the mean of its divisors is an integer number (30896838).

Almost surely, 2^123530731 is an apocalyptic number.

123530731 is a deficient number, since it is larger than the sum of its proper divisors (56621).

123530731 is an equidigital number, since it uses as much as digits as its factorization.

123530731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56620.

The product of its (nonzero) digits is 1890, while the sum is 25.

The square root of 123530731 is about 11114.4379525012. The cubic root of 123530731 is about 498.0332485879.

The spelling of 123530731 in words is "one hundred twenty-three million, five hundred thirty thousand, seven hundred thirty-one".