81552125 has 8 divisors (see below), whose sum is σ = 101777208. Its totient is φ = 65241600.

The previous prime is 81552113. The next prime is 81552131. The reversal of 81552125 is 52125518.

It can be written as a sum of positive squares in 4 ways, for example, as 209764 + 81342361 = 458^2 + 9019^2 .

It is not a de Polignac number, because 81552125 - 2⁴ = 81552109 is a prime.

It is a Duffinian number.

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, 326084 + ... + 326333.

It is an arithmetic number, because the mean of its divisors is an integer number (12722151).

Almost surely, 2^81552125 is an apocalyptic number.

It is an amenable number.

81552125 is a deficient number, since it is larger than the sum of its proper divisors (20225083).

81552125 is an equidigital number, since it uses as much as digits as its factorization.

81552125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652432 (or 652422 counting only the distinct ones).

The product of its digits is 4000, while the sum is 29.

The square root of 81552125 is about 9030.6215179244. The cubic root of 81552125 is about 433.6557347605.

The spelling of 81552125 in words is "eighty-one million, five hundred fifty-two thousand, one hundred twenty-five".