131333729 has 2 divisors, whose sum is σ = 131333730. Its totient is φ = 131333728.

The previous prime is 131333717. The next prime is 131333731. The reversal of 131333729 is 927333131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122766400 + 8567329 = 11080^2 + 2927^2 .

It is a cyclic number.

It is not a de Polignac number, because 131333729 - 2¹² = 131329633 is a prime.

Together with 131333731, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 131333695 and 131333704.

It is not a weakly prime, because it can be changed into another prime (131333029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65666864 + 65666865.

It is an arithmetic number, because the mean of its divisors is an integer number (65666865).

Almost surely, 2^131333729 is an apocalyptic number.

It is an amenable number.

131333729 is a deficient number, since it is larger than the sum of its proper divisors (1).

131333729 is an equidigital number, since it uses as much as digits as its factorization.

131333729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 32.

The square root of 131333729 is about 11460.0928879307. The cubic root of 131333729 is about 508.3062212779.

The spelling of 131333729 in words is "one hundred thirty-one million, three hundred thirty-three thousand, seven hundred twenty-nine".