81941250 has 40 divisors (see below), whose sum is σ = 204796944. Its totient is φ = 21850000.

The previous prime is 81941231. The next prime is 81941261. The reversal of 81941250 is 5214918.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7176 + ... + 14675.

Almost surely, 2^81941250 is an apocalyptic number.

81941250 is an abundant number, since it is smaller than the sum of its proper divisors (122855694).

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

81941250 is a wasteful number, since it uses less digits than its factorization.

81941250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21876 (or 21861 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 81941250 is about 9052.1406308121. The cubic root of 81941250 is about 434.3443683867.

The spelling of 81941250 in words is "eighty-one million, nine hundred forty-one thousand, two hundred fifty".