71351681 has 8 divisors (see below), whose sum is σ = 74749824. Its totient is φ = 67978240.

The previous prime is 71351659. The next prime is 71351689. The reversal of 71351681 is 18615317.

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 71351681 - 2⁶ = 71351617 is a prime.

It is a super-2 number, since 2×71351681² = 10182124763051522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71351689) 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, 125 + ... + 11946.

It is an arithmetic number, because the mean of its divisors is an integer number (9343728).

Almost surely, 2^71351681 is an apocalyptic number.

It is an amenable number.

71351681 is a deficient number, since it is larger than the sum of its proper divisors (3398143).

71351681 is a wasteful number, since it uses less digits than its factorization.

71351681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12351.

The product of its digits is 5040, while the sum is 32.

The square root of 71351681 is about 8446.9924233422. The cubic root of 71351681 is about 414.7643332216.

Adding to 71351681 its reverse (18615317), we get a palindrome (89966998).

The spelling of 71351681 in words is "seventy-one million, three hundred fifty-one thousand, six hundred eighty-one".