81143352471 has 16 divisors (see below), whose sum is σ = 109870646400. Its totient is φ = 53256765408.

The previous prime is 81143352461. The next prime is 81143352491. The reversal of 81143352471 is 17425334118.

It is not a de Polignac number, because 81143352471 - 2⁵ = 81143352439 is a prime.

It is a super-3 number, since 3×81143352471³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81143352431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225400 + ... + 461618.

It is an arithmetic number, because the mean of its divisors is an integer number (6866915400).

Almost surely, 2^81143352471 is an apocalyptic number.

81143352471 is a deficient number, since it is larger than the sum of its proper divisors (28727293929).

81143352471 is a wasteful number, since it uses less digits than its factorization.

81143352471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237998.

The product of its digits is 80640, while the sum is 39.

Adding to 81143352471 its reverse (17425334118), we get a palindrome (98568686589).

The spelling of 81143352471 in words is "eighty-one billion, one hundred forty-three million, three hundred fifty-two thousand, four hundred seventy-one".