81025173 has 12 divisors (see below), whose sum is σ = 117189280. Its totient is φ = 53946216.

The previous prime is 81025169. The next prime is 81025187. The reversal of 81025173 is 37152018.

It is not a de Polignac number, because 81025173 - 2² = 81025169 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81025163) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1938 + ... + 12876.

Almost surely, 2^81025173 is an apocalyptic number.

It is an amenable number.

81025173 is a deficient number, since it is larger than the sum of its proper divisors (36164107).

81025173 is a wasteful number, since it uses less digits than its factorization.

81025173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11768 (or 11765 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 81025173 is about 9001.3983913612. The cubic root of 81025173 is about 432.7196883615.

The spelling of 81025173 in words is "eighty-one million, twenty-five thousand, one hundred seventy-three".