118312131 has 16 divisors (see below), whose sum is σ = 181146368. Its totient is φ = 67284000.

The previous prime is 118312127. The next prime is 118312153. The reversal of 118312131 is 131213811.

It is a happy number.

It is not a de Polignac number, because 118312131 - 2² = 118312127 is a prime.

It is a super-2 number, since 2×118312131² = 27995520683522322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 118312098 and 118312107.

It is not an unprimeable number, because it can be changed into a prime (118312111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8920 + ... + 17781.

It is an arithmetic number, because the mean of its divisors is an integer number (11321648).

Almost surely, 2^118312131 is an apocalyptic number.

118312131 is a deficient number, since it is larger than the sum of its proper divisors (62834237).

118312131 is a wasteful number, since it uses less digits than its factorization.

118312131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26922.

The product of its digits is 144, while the sum is 21.

The square root of 118312131 is about 10877.1379967343. The cubic root of 118312131 is about 490.9189073576.

Adding to 118312131 its reverse (131213811), we get a palindrome (249525942).

The spelling of 118312131 in words is "one hundred eighteen million, three hundred twelve thousand, one hundred thirty-one".