71391481 has 24 divisors (see below), whose sum is σ = 87800064. Its totient is φ = 57788640.

The previous prime is 71391473. The next prime is 71391499. The reversal of 71391481 is 18419317.

It is not a de Polignac number, because 71391481 - 2³ = 71391473 is a prime.

It is a super-2 number, since 2×71391481² = 10193487118746722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71391401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64771 + ... + 65863.

It is an arithmetic number, because the mean of its divisors is an integer number (3658336).

Almost surely, 2^71391481 is an apocalyptic number.

It is an amenable number.

71391481 is a deficient number, since it is larger than the sum of its proper divisors (16408583).

71391481 is a wasteful number, since it uses less digits than its factorization.

71391481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181 (or 1174 counting only the distinct ones).

The product of its digits is 6048, while the sum is 34.

The square root of 71391481 is about 8449.3479630087. The cubic root of 71391481 is about 414.8414374648.

The spelling of 71391481 in words is "seventy-one million, three hundred ninety-one thousand, four hundred eighty-one".