123506331131 has 4 divisors (see below), whose sum is σ = 123539419872. Its totient is φ = 123473242392.

The previous prime is 123506331121. The next prime is 123506331149. The reversal of 123506331131 is 131133605321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123506331131 - 2¹⁰ = 123506330107 is a prime.

It is a super-2 number, since 2×123506331131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123506331094 and 123506331103.

It is not an unprimeable number, because it can be changed into a prime (123506331121) 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, 16538771 + ... + 16546236.

It is an arithmetic number, because the mean of its divisors is an integer number (30884854968).

Almost surely, 2^123506331131 is an apocalyptic number.

123506331131 is a deficient number, since it is larger than the sum of its proper divisors (33088741).

123506331131 is an equidigital number, since it uses as much as digits as its factorization.

123506331131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33088740.

The product of its (nonzero) digits is 4860, while the sum is 29.

Adding to 123506331131 its reverse (131133605321), we get a palindrome (254639936452).

The spelling of 123506331131 in words is "one hundred twenty-three billion, five hundred six million, three hundred thirty-one thousand, one hundred thirty-one".