131021117 has 4 divisors (see below), whose sum is σ = 134216796. Its totient is φ = 127825440.

The previous prime is 131021071. The next prime is 131021119. The reversal of 131021117 is 711120131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 711120131 = 37 ⋅19219463.

It can be written as a sum of positive squares in 2 ways, for example, as 5827396 + 125193721 = 2414^2 + 11189^2 .

It is a cyclic number.

It is not a de Polignac number, because 131021117 - 2¹⁰ = 131020093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131021095 and 131021104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131021119) 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, 1597778 + ... + 1597859.

It is an arithmetic number, because the mean of its divisors is an integer number (33554199).

Almost surely, 2^131021117 is an apocalyptic number.

It is an amenable number.

131021117 is a deficient number, since it is larger than the sum of its proper divisors (3195679).

131021117 is an equidigital number, since it uses as much as digits as its factorization.

131021117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3195678.

The product of its (nonzero) digits is 42, while the sum is 17.

The square root of 131021117 is about 11446.4456055144. The cubic root of 131021117 is about 507.9025959218.

Adding to 131021117 its reverse (711120131), we get a palindrome (842141248).

The spelling of 131021117 in words is "one hundred thirty-one million, twenty-one thousand, one hundred seventeen".