71381563 has 8 divisors (see below), whose sum is σ = 79191360. Its totient is φ = 63791880.

The previous prime is 71381509. The next prime is 71381617. The reversal of 71381563 is 36518317.

It is an interprime number because it is at equal distance from previous prime (71381509) and next prime (71381617).

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

It is a cyclic number.

It is not a de Polignac number, because 71381563 - 2¹³ = 71373371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71381503) 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, 54345 + ... + 55642.

It is an arithmetic number, because the mean of its divisors is an integer number (9898920).

Almost surely, 2^71381563 is an apocalyptic number.

71381563 is a deficient number, since it is larger than the sum of its proper divisors (7809797).

71381563 is a wasteful number, since it uses less digits than its factorization.

71381563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110057.

The product of its digits is 15120, while the sum is 34.

The square root of 71381563 is about 8448.7610334297. The cubic root of 71381563 is about 414.8222260786.

The spelling of 71381563 in words is "seventy-one million, three hundred eighty-one thousand, five hundred sixty-three".