131705789 has 2 divisors, whose sum is σ = 131705790. Its totient is φ = 131705788.

The previous prime is 131705773. The next prime is 131705803. The reversal of 131705789 is 987507131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111302500 + 20403289 = 10550^2 + 4517^2 .

It is a cyclic number.

It is not a de Polignac number, because 131705789 - 2⁴ = 131705773 is a prime.

It is a super-2 number, since 2×131705789² = 34692829712225042, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131405789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65852894 + 65852895.

It is an arithmetic number, because the mean of its divisors is an integer number (65852895).

Almost surely, 2^131705789 is an apocalyptic number.

It is an amenable number.

131705789 is a deficient number, since it is larger than the sum of its proper divisors (1).

131705789 is an equidigital number, since it uses as much as digits as its factorization.

131705789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 41.

The square root of 131705789 is about 11476.3142602492. The cubic root of 131705789 is about 508.7857683219.

The spelling of 131705789 in words is "one hundred thirty-one million, seven hundred five thousand, seven hundred eighty-nine".