131608121 has 2 divisors, whose sum is σ = 131608122. Its totient is φ = 131608120.

The previous prime is 131608111. The next prime is 131608159. The reversal of 131608121 is 121806131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81198121 + 50410000 = 9011^2 + 7100^2 .

It is a cyclic number.

It is not a de Polignac number, because 131608121 - 2¹⁴ = 131591737 is a prime.

It is a super-3 number, since 3×131608121³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (131608111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65804060 + 65804061.

It is an arithmetic number, because the mean of its divisors is an integer number (65804061).

Almost surely, 2^131608121 is an apocalyptic number.

It is an amenable number.

131608121 is a deficient number, since it is larger than the sum of its proper divisors (1).

131608121 is an equidigital number, since it uses as much as digits as its factorization.

131608121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 131608121 is about 11472.0582721672. The cubic root of 131608121 is about 508.6599718349.

The spelling of 131608121 in words is "one hundred thirty-one million, six hundred eight thousand, one hundred twenty-one".