81959250 has 32 divisors (see below), whose sum is σ = 204572160. Its totient is φ = 21855600.

The previous prime is 81959243. The next prime is 81959279. The reversal of 81959250 is 5295918.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81959199 and 81959208.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53890 + ... + 55389.

It is an arithmetic number, because the mean of its divisors is an integer number (6392880).

Almost surely, 2^81959250 is an apocalyptic number.

81959250 is an abundant number, since it is smaller than the sum of its proper divisors (122612910).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81959250 is a wasteful number, since it uses less digits than its factorization.

81959250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109299 (or 109289 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 39.

The square root of 81959250 is about 9053.1348161838. The cubic root of 81959250 is about 434.3761701399.

The spelling of 81959250 in words is "eighty-one million, nine hundred fifty-nine thousand, two hundred fifty".