71481439 has 4 divisors (see below), whose sum is σ = 75243640. Its totient is φ = 67719240.

The previous prime is 71481419. The next prime is 71481461. The reversal of 71481439 is 93418417.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71481439 - 2¹¹ = 71479391 is a prime.

It is a super-2 number, since 2×71481439² = 10219192243021442, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71481398 and 71481407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71481419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1881072 + ... + 1881109.

It is an arithmetic number, because the mean of its divisors is an integer number (18810910).

Almost surely, 2^71481439 is an apocalyptic number.

71481439 is a deficient number, since it is larger than the sum of its proper divisors (3762201).

71481439 is a wasteful number, since it uses less digits than its factorization.

71481439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3762200.

The product of its digits is 24192, while the sum is 37.

The square root of 71481439 is about 8454.6696564680. The cubic root of 71481439 is about 415.0156069033.

The spelling of 71481439 in words is "seventy-one million, four hundred eighty-one thousand, four hundred thirty-nine".