82131125571 has 24 divisors (see below), whose sum is σ = 129428672880. Its totient is φ = 49772620800.

The previous prime is 82131125519. The next prime is 82131125581. The reversal of 82131125571 is 17552113128.

82131125571 is a `hidden beast` number, since 8 + 21 + 311 + 255 + 71 = 666.

It is not a de Polignac number, because 82131125571 - 2⁹ = 82131125059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82131125501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1787931 + ... + 1833291.

It is an arithmetic number, because the mean of its divisors is an integer number (5392861370).

Almost surely, 2^82131125571 is an apocalyptic number.

82131125571 is a deficient number, since it is larger than the sum of its proper divisors (47297547309).

82131125571 is a wasteful number, since it uses less digits than its factorization.

82131125571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63667 (or 63664 counting only the distinct ones).

The product of its digits is 16800, while the sum is 36.

Adding to 82131125571 its reverse (17552113128), we get a palindrome (99683238699).

It can be divided in two parts, 82131 and 125571, that added together give a palindrome (207702).

The spelling of 82131125571 in words is "eighty-two billion, one hundred thirty-one million, one hundred twenty-five thousand, five hundred seventy-one".