71381124 has 18 divisors (see below), whose sum is σ = 180435710. Its totient is φ = 23793696.

The previous prime is 71381117. The next prime is 71381131. The reversal of 71381124 is 42118317.

It is an interprime number because it is at equal distance from previous prime (71381117) and next prime (71381131).

It can be written as a sum of positive squares in only one way, i.e., 70862724 + 518400 = 8418^2 + 720^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 991369 + ... + 991440.

Almost surely, 2^71381124 is an apocalyptic number.

It is an amenable number.

71381124 is an abundant number, since it is smaller than the sum of its proper divisors (109054586).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71381124 is a wasteful number, since it uses less digits than its factorization.

71381124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1982819 (or 1982814 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 71381124 is about 8448.7350532491. The cubic root of 71381124 is about 414.8213756848.

The spelling of 71381124 in words is "seventy-one million, three hundred eighty-one thousand, one hundred twenty-four".