81119225 has 12 divisors (see below), whose sum is σ = 109732560. Its totient is φ = 58995600.

The previous prime is 81119221. The next prime is 81119237. The reversal of 81119225 is 52291118.

It is not a de Polignac number, because 81119225 - 2² = 81119221 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81119221) 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 11 ways as a sum of consecutive naturals, for example, 147215 + ... + 147764.

It is an arithmetic number, because the mean of its divisors is an integer number (9144380).

Almost surely, 2^81119225 is an apocalyptic number.

It is an amenable number.

81119225 is a deficient number, since it is larger than the sum of its proper divisors (28613335).

81119225 is a wasteful number, since it uses less digits than its factorization.

81119225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295000 (or 294995 counting only the distinct ones).

The product of its digits is 1440, while the sum is 29.

The square root of 81119225 is about 9006.6211755575. The cubic root of 81119225 is about 432.8870536943.

The spelling of 81119225 in words is "eighty-one million, one hundred nineteen thousand, two hundred twenty-five".