131909189 has 2 divisors, whose sum is σ = 131909190. Its totient is φ = 131909188.

The previous prime is 131909159. The next prime is 131909201. The reversal of 131909189 is 981909131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100661089 + 31248100 = 10033^2 + 5590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131909189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131909159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65954594 + 65954595.

It is an arithmetic number, because the mean of its divisors is an integer number (65954595).

Almost surely, 2^131909189 is an apocalyptic number.

It is an amenable number.

131909189 is a deficient number, since it is larger than the sum of its proper divisors (1).

131909189 is an equidigital number, since it uses as much as digits as its factorization.

131909189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 41.

The square root of 131909189 is about 11485.1725716247. The cubic root of 131909189 is about 509.0475482540.

The spelling of 131909189 in words is "one hundred thirty-one million, nine hundred nine thousand, one hundred eighty-nine".