131111623 has 4 divisors (see below), whose sum is σ = 133901280. Its totient is φ = 128321968.

The previous prime is 131111621. The next prime is 131111641. The reversal of 131111623 is 326111131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326111131 = 79 ⋅4127989.

It is a cyclic number.

It is not a de Polignac number, because 131111623 - 2¹ = 131111621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131111623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131111621) 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, 1394758 + ... + 1394851.

It is an arithmetic number, because the mean of its divisors is an integer number (33475320).

Almost surely, 2^131111623 is an apocalyptic number.

131111623 is a deficient number, since it is larger than the sum of its proper divisors (2789657).

131111623 is an equidigital number, since it uses as much as digits as its factorization.

131111623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2789656.

The product of its digits is 108, while the sum is 19.

The square root of 131111623 is about 11450.3983773491. The cubic root of 131111623 is about 508.0195176641.

Adding to 131111623 its reverse (326111131), we get a palindrome (457222754).

The spelling of 131111623 in words is "one hundred thirty-one million, one hundred eleven thousand, six hundred twenty-three".