123116531 has 4 divisors (see below), whose sum is σ = 127088064. Its totient is φ = 119145000.

The previous prime is 123116519. The next prime is 123116569. The reversal of 123116531 is 135611321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135611321 = 79 ⋅1716599.

It is a cyclic number.

It is not a de Polignac number, because 123116531 - 2²² = 118922227 is a prime.

It is a super-2 number, since 2×123116531² = 30315360410947922, 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 = 123116497 and 123116506.

It is not an unprimeable number, because it can be changed into a prime (123106531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1985720 + ... + 1985781.

It is an arithmetic number, because the mean of its divisors is an integer number (31772016).

Almost surely, 2^123116531 is an apocalyptic number.

123116531 is a deficient number, since it is larger than the sum of its proper divisors (3971533).

123116531 is an equidigital number, since it uses as much as digits as its factorization.

123116531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3971532.

The product of its digits is 540, while the sum is 23.

The square root of 123116531 is about 11095.7888858792. The cubic root of 123116531 is about 497.4759881680.

Adding to 123116531 its reverse (135611321), we get a palindrome (258727852).

The spelling of 123116531 in words is "one hundred twenty-three million, one hundred sixteen thousand, five hundred thirty-one".