71181481 has 8 divisors (see below), whose sum is σ = 84887424. Its totient is φ = 58359840.

The previous prime is 71181479. The next prime is 71181493. The reversal of 71181481 is 18418117.

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

It is not a de Polignac number, because 71181481 - 2¹ = 71181479 is a prime.

It is a super-2 number, since 2×71181481² = 10133606474706722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71181401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220900 + ... + 221221.

It is an arithmetic number, because the mean of its divisors is an integer number (10610928).

Almost surely, 2^71181481 is an apocalyptic number.

It is an amenable number.

71181481 is a deficient number, since it is larger than the sum of its proper divisors (13705943).

71181481 is a wasteful number, since it uses less digits than its factorization.

71181481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442151.

The product of its digits is 1792, while the sum is 31.

The square root of 71181481 is about 8436.9118165357. The cubic root of 71181481 is about 414.4342821607.

Adding to 71181481 its reverse (18418117), we get a palindrome (89599598).

The spelling of 71181481 in words is "seventy-one million, one hundred eighty-one thousand, four hundred eighty-one".