71381391 has 8 divisors (see below), whose sum is σ = 97200384. Its totient is φ = 46575000.

The previous prime is 71381381. The next prime is 71381467. The reversal of 71381391 is 19318317.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71381391 - 2¹⁸ = 71119247 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71381381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252985 + ... + 253266.

It is an arithmetic number, because the mean of its divisors is an integer number (12150048).

Almost surely, 2^71381391 is an apocalyptic number.

71381391 is a deficient number, since it is larger than the sum of its proper divisors (25818993).

71381391 is a wasteful number, since it uses less digits than its factorization.

71381391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506301.

The product of its digits is 4536, while the sum is 33.

The square root of 71381391 is about 8448.7508544163. The cubic root of 71381391 is about 414.8218928951.

The spelling of 71381391 in words is "seventy-one million, three hundred eighty-one thousand, three hundred ninety-one".