81231461071 has 8 divisors (see below), whose sum is σ = 82081700064. Its totient is φ = 80381483520.

The previous prime is 81231461057. The next prime is 81231461099. The reversal of 81231461071 is 17016413218.

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 81231461071 - 2¹⁵ = 81231428303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81231461011) 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, 593886 + ... + 717748.

It is an arithmetic number, because the mean of its divisors is an integer number (10260212508).

Almost surely, 2^81231461071 is an apocalyptic number.

81231461071 is a deficient number, since it is larger than the sum of its proper divisors (850238993).

81231461071 is a wasteful number, since it uses less digits than its factorization.

81231461071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130721.

The product of its (nonzero) digits is 8064, while the sum is 34.

Adding to 81231461071 its reverse (17016413218), we get a palindrome (98247874289).

The spelling of 81231461071 in words is "eighty-one billion, two hundred thirty-one million, four hundred sixty-one thousand, seventy-one".