137731786729 has 2 divisors, whose sum is σ = 137731786730. Its totient is φ = 137731786728.

The previous prime is 137731786679. The next prime is 137731786789. The reversal of 137731786729 is 927687137731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91182861225 + 46548925504 = 301965^2 + 215752^2 .

It is a cyclic number.

It is not a de Polignac number, because 137731786729 - 2⁹ = 137731786217 is a prime.

It is not a weakly prime, because it can be changed into another prime (137731786789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68865893364 + 68865893365.

It is an arithmetic number, because the mean of its divisors is an integer number (68865893365).

Almost surely, 2^137731786729 is an apocalyptic number.

It is an amenable number.

137731786729 is a deficient number, since it is larger than the sum of its proper divisors (1).

137731786729 is an equidigital number, since it uses as much as digits as its factorization.

137731786729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18670176, while the sum is 61.

The spelling of 137731786729 in words is "one hundred thirty-seven billion, seven hundred thirty-one million, seven hundred eighty-six thousand, seven hundred twenty-nine".