71231729 has 2 divisors, whose sum is σ = 71231730. Its totient is φ = 71231728.

The previous prime is 71231723. The next prime is 71231737. The reversal of 71231729 is 92713217.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66178225 + 5053504 = 8135^2 + 2248^2 .

It is a cyclic number.

It is not a de Polignac number, because 71231729 - 2²⁰ = 70183153 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 71231695 and 71231704.

It is not a weakly prime, because it can be changed into another prime (71231723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35615864 + 35615865.

It is an arithmetic number, because the mean of its divisors is an integer number (35615865).

Almost surely, 2^71231729 is an apocalyptic number.

It is an amenable number.

71231729 is a deficient number, since it is larger than the sum of its proper divisors (1).

71231729 is an equidigital number, since it uses as much as digits as its factorization.

71231729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5292, while the sum is 32.

The square root of 71231729 is about 8439.8891580399. The cubic root of 71231729 is about 414.5317775361.

The spelling of 71231729 in words is "seventy-one million, two hundred thirty-one thousand, seven hundred twenty-nine".