81170325 has 36 divisors (see below), whose sum is σ = 153944388. Its totient is φ = 40742400.

The previous prime is 81170311. The next prime is 81170329. The reversal of 81170325 is 52307118.

It can be written as a sum of positive squares in 6 ways, for example, as 7193124 + 73977201 = 2682^2 + 8601^2 .

It is not a de Polignac number, because 81170325 - 2⁵ = 81170293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81170329) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6786 + ... + 14435.

It is an arithmetic number, because the mean of its divisors is an integer number (4276233).

Almost surely, 2^81170325 is an apocalyptic number.

81170325 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

81170325 is a deficient number, since it is larger than the sum of its proper divisors (72774063).

81170325 is a wasteful number, since it uses less digits than its factorization.

81170325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21254 (or 21246 counting only the distinct ones).

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

The square root of 81170325 is about 9009.4575308395. The cubic root of 81170325 is about 432.9779318029.

The spelling of 81170325 in words is "eighty-one million, one hundred seventy thousand, three hundred twenty-five".