71381329 has 2 divisors, whose sum is σ = 71381330. Its totient is φ = 71381328.

The previous prime is 71381279. The next prime is 71381339. The reversal of 71381329 is 92318317.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67617729 + 3763600 = 8223^2 + 1940^2 .

It is a cyclic number.

It is not a de Polignac number, because 71381329 - 2²⁵ = 37826897 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71381294 and 71381303.

It is not a weakly prime, because it can be changed into another prime (71381339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35690664 + 35690665.

It is an arithmetic number, because the mean of its divisors is an integer number (35690665).

Almost surely, 2^71381329 is an apocalyptic number.

It is an amenable number.

71381329 is a deficient number, since it is larger than the sum of its proper divisors (1).

71381329 is an equidigital number, since it uses as much as digits as its factorization.

71381329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 34.

The square root of 71381329 is about 8448.7471852340. The cubic root of 71381329 is about 414.8217727940.

The spelling of 71381329 in words is "seventy-one million, three hundred eighty-one thousand, three hundred twenty-nine".