131691743 has 2 divisors, whose sum is σ = 131691744. Its totient is φ = 131691742.

The previous prime is 131691731. The next prime is 131691773. The reversal of 131691743 is 347196131.

It is a happy number.

131691743 is nontrivially palindromic in base 2.

It is a weak prime.

It is an emirp because it is prime and its reverse (347196131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131691743 - 2¹⁶ = 131626207 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131691773) 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, 65845871 + 65845872.

It is an arithmetic number, because the mean of its divisors is an integer number (65845872).

Almost surely, 2^131691743 is an apocalyptic number.

131691743 is a deficient number, since it is larger than the sum of its proper divisors (1).

131691743 is an equidigital number, since it uses as much as digits as its factorization.

131691743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 35.

The square root of 131691743 is about 11475.7022878776. The cubic root of 131691743 is about 508.7676808888.

The spelling of 131691743 in words is "one hundred thirty-one million, six hundred ninety-one thousand, seven hundred forty-three".