131116021 has 2 divisors, whose sum is σ = 131116022. Its totient is φ = 131116020.

The previous prime is 131116001. The next prime is 131116043. The reversal of 131116021 is 120611131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127464100 + 3651921 = 11290^2 + 1911^2 .

It is a cyclic number.

It is not a de Polignac number, because 131116021 - 2¹³ = 131107829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131115986 and 131116004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131116001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65558010 + 65558011.

It is an arithmetic number, because the mean of its divisors is an integer number (65558011).

Almost surely, 2^131116021 is an apocalyptic number.

It is an amenable number.

131116021 is a deficient number, since it is larger than the sum of its proper divisors (1).

131116021 is an equidigital number, since it uses as much as digits as its factorization.

131116021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 131116021 is about 11450.5904214586. The cubic root of 131116021 is about 508.0251979255.

Adding to 131116021 its reverse (120611131), we get a palindrome (251727152).

The spelling of 131116021 in words is "one hundred thirty-one million, one hundred sixteen thousand, twenty-one".