131243729 has 2 divisors, whose sum is σ = 131243730. Its totient is φ = 131243728.

The previous prime is 131243701. The next prime is 131243767. The reversal of 131243729 is 927342131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79691329 + 51552400 = 8927^2 + 7180^2 .

It is an emirp because it is prime and its reverse (927342131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131243729 - 2¹⁶ = 131178193 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 131243695 and 131243704.

It is not a weakly prime, because it can be changed into another prime (131243929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65621864 + 65621865.

It is an arithmetic number, because the mean of its divisors is an integer number (65621865).

Almost surely, 2^131243729 is an apocalyptic number.

It is an amenable number.

131243729 is a deficient number, since it is larger than the sum of its proper divisors (1).

131243729 is an equidigital number, since it uses as much as digits as its factorization.

131243729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 32.

The square root of 131243729 is about 11456.1655452424. The cubic root of 131243729 is about 508.1900845369.

The spelling of 131243729 in words is "one hundred thirty-one million, two hundred forty-three thousand, seven hundred twenty-nine".