131123623 has 4 divisors (see below), whose sum is σ = 133080760. Its totient is φ = 129166488.

The previous prime is 131123609. The next prime is 131123633. The reversal of 131123623 is 326321131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326321131 = 131 ⋅2491001.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131123623 is a prime.

It is a super-2 number, since 2×131123623² = 34386809017292258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 131123594 and 131123603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131123633) 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, 978468 + ... + 978601.

It is an arithmetic number, because the mean of its divisors is an integer number (33270190).

Almost surely, 2^131123623 is an apocalyptic number.

131123623 is a deficient number, since it is larger than the sum of its proper divisors (1957137).

131123623 is an equidigital number, since it uses as much as digits as its factorization.

131123623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1957136.

The product of its digits is 648, while the sum is 22.

The square root of 131123623 is about 11450.9223645958. The cubic root of 131123623 is about 508.0350160314.

Adding to 131123623 its reverse (326321131), we get a palindrome (457444754).

The spelling of 131123623 in words is "one hundred thirty-one million, one hundred twenty-three thousand, six hundred twenty-three".