131311121 has 4 divisors (see below), whose sum is σ = 134364912. Its totient is φ = 128257332.

The previous prime is 131311099. The next prime is 131311123. The reversal of 131311121 is 121113131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 121113131 = 433 ⋅279707.

It is a cyclic number.

It is not a de Polignac number, because 131311121 - 2⁶ = 131311057 is a prime.

It is a super-2 number, since 2×131311121² = 34485220996553282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131311096 and 131311105.

It is not an unprimeable number, because it can be changed into a prime (131311123) 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, 1526831 + ... + 1526916.

It is an arithmetic number, because the mean of its divisors is an integer number (33591228).

Almost surely, 2^131311121 is an apocalyptic number.

It is an amenable number.

131311121 is a deficient number, since it is larger than the sum of its proper divisors (3053791).

131311121 is an equidigital number, since it uses as much as digits as its factorization.

131311121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3053790.

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

The square root of 131311121 is about 11459.1064660383. The cubic root of 131311121 is about 508.2770527198.

Adding to 131311121 its reverse (121113131), we get a palindrome (252424252).

The spelling of 131311121 in words is "one hundred thirty-one million, three hundred eleven thousand, one hundred twenty-one".