81125301831 has 8 divisors (see below), whose sum is σ = 123619507584. Its totient is φ = 46357315320.

The previous prime is 81125301827. The next prime is 81125301839. The reversal of 81125301831 is 13810352118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81125301831 - 2² = 81125301827 is a prime.

It is a super-3 number, since 3×81125301831³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 81125301792 and 81125301801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81125301839) 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, 1931554785 + ... + 1931554826.

It is an arithmetic number, because the mean of its divisors is an integer number (15452438448).

Almost surely, 2^81125301831 is an apocalyptic number.

81125301831 is a deficient number, since it is larger than the sum of its proper divisors (42494205753).

81125301831 is a wasteful number, since it uses less digits than its factorization.

81125301831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3863109621.

The product of its (nonzero) digits is 5760, while the sum is 33.

Adding to 81125301831 its reverse (13810352118), we get a palindrome (94935653949).

The spelling of 81125301831 in words is "eighty-one billion, one hundred twenty-five million, three hundred one thousand, eight hundred thirty-one".