131113823 has 4 divisors (see below), whose sum is σ = 136814448. Its totient is φ = 125413200.

The previous prime is 131113799. The next prime is 131113831. The reversal of 131113823 is 328311131.

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 131113823 - 2²⁶ = 64004959 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 5700601 = 131113823 / (1 + 3 + 1 + 1 + 1 + 3 + 8 + 2 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131113883) 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, 2850278 + ... + 2850323.

It is an arithmetic number, because the mean of its divisors is an integer number (34203612).

Almost surely, 2^131113823 is an apocalyptic number.

131113823 is a deficient number, since it is larger than the sum of its proper divisors (5700625).

131113823 is an equidigital number, since it uses as much as digits as its factorization.

131113823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5700624.

The product of its digits is 432, while the sum is 23.

The square root of 131113823 is about 11450.4944434727. The cubic root of 131113823 is about 508.0223591023.

Adding to 131113823 its reverse (328311131), we get a palindrome (459424954).

The spelling of 131113823 in words is "one hundred thirty-one million, one hundred thirteen thousand, eight hundred twenty-three".