131231121 has 8 divisors (see below), whose sum is σ = 199971264. Its totient is φ = 74989200.

The previous prime is 131231071. The next prime is 131231131. The reversal of 131231121 is 121132131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131231121 - 2⁶ = 131231057 is a prime.

It is a super-3 number, since 3×131231121³ (a number of 25 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 131231121.

It is not an unprimeable number, because it can be changed into a prime (131231131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3124530 + ... + 3124571.

It is an arithmetic number, because the mean of its divisors is an integer number (24996408).

Almost surely, 2^131231121 is an apocalyptic number.

It is an amenable number.

131231121 is a deficient number, since it is larger than the sum of its proper divisors (68740143).

131231121 is an equidigital number, since it uses as much as digits as its factorization.

131231121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6249111.

The product of its digits is 36, while the sum is 15.

The square root of 131231121 is about 11455.6152606484. The cubic root of 131231121 is about 508.1738108304.

Adding to 131231121 its reverse (121132131), we get a palindrome (252363252).

The spelling of 131231121 in words is "one hundred thirty-one million, two hundred thirty-one thousand, one hundred twenty-one".