131123111 has 16 divisors (see below), whose sum is σ = 153098304. Its totient is φ = 109983744.

The previous prime is 131123107. The next prime is 131123131. The reversal of 131123111 is 111321131.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 131123111 - 2² = 131123107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131123131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69071 + ... + 70943.

It is an arithmetic number, because the mean of its divisors is an integer number (9568644).

Almost surely, 2^131123111 is an apocalyptic number.

131123111 is a deficient number, since it is larger than the sum of its proper divisors (21975193).

131123111 is a wasteful number, since it uses less digits than its factorization.

131123111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2090.

The product of its digits is 18, while the sum is 14.

The square root of 131123111 is about 11450.9000082963. The cubic root of 131123111 is about 508.0343547870.

Adding to 131123111 its reverse (111321131), we get a palindrome (242444242).

The spelling of 131123111 in words is "one hundred thirty-one million, one hundred twenty-three thousand, one hundred eleven".