81053071 has 4 divisors (see below), whose sum is σ = 88421544. Its totient is φ = 73684600.

The previous prime is 81053053. The next prime is 81053087. The reversal of 81053071 is 17035018.

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

It is not a de Polignac number, because 81053071 - 2¹¹ = 81051023 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 (81053041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3684220 + ... + 3684241.

It is an arithmetic number, because the mean of its divisors is an integer number (22105386).

Almost surely, 2^81053071 is an apocalyptic number.

81053071 is a deficient number, since it is larger than the sum of its proper divisors (7368473).

81053071 is a wasteful number, since it uses less digits than its factorization.

81053071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7368472.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 81053071 is about 9002.9479061028. The cubic root of 81053071 is about 432.7693462977.

Adding to 81053071 its reverse (17035018), we get a palindrome (98088089).

The spelling of 81053071 in words is "eighty-one million, fifty-three thousand, seventy-one".