81119125 has 8 divisors (see below), whose sum is σ = 101236824. Its totient is φ = 64895200.

The previous prime is 81119107. The next prime is 81119153. The reversal of 81119125 is 52191118.

It can be written as a sum of positive squares in 4 ways, for example, as 101124 + 81018001 = 318^2 + 9001^2 .

It is not a de Polignac number, because 81119125 - 2⁷ = 81118997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81119093 and 81119102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324352 + ... + 324601.

It is an arithmetic number, because the mean of its divisors is an integer number (12654603).

Almost surely, 2^81119125 is an apocalyptic number.

It is an amenable number.

81119125 is a deficient number, since it is larger than the sum of its proper divisors (20117699).

81119125 is an equidigital number, since it uses as much as digits as its factorization.

81119125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648968 (or 648958 counting only the distinct ones).

The product of its digits is 720, while the sum is 28.

The square root of 81119125 is about 9006.6156240843. The cubic root of 81119125 is about 432.8868758132.

The spelling of 81119125 in words is "eighty-one million, one hundred nineteen thousand, one hundred twenty-five".