81412625 has 64 divisors (see below), whose sum is σ = 125798400. Its totient is φ = 51364800.

The previous prime is 81412621. The next prime is 81412627. The reversal of 81412625 is 52621418.

It is not a de Polignac number, because 81412625 - 2² = 81412621 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81412621) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 980834 + ... + 980916.

It is an arithmetic number, because the mean of its divisors is an integer number (1965600).

Almost surely, 2^81412625 is an apocalyptic number.

It is an amenable number.

81412625 is a deficient number, since it is larger than the sum of its proper divisors (44385775).

81412625 is a wasteful number, since it uses less digits than its factorization.

81412625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183 (or 173 counting only the distinct ones).

The product of its digits is 3840, while the sum is 29.

The square root of 81412625 is about 9022.8944912373. The cubic root of 81412625 is about 433.4083285717.

The spelling of 81412625 in words is "eighty-one million, four hundred twelve thousand, six hundred twenty-five".