81202825 has 12 divisors (see below), whose sum is σ = 109845648. Its totient is φ = 59056400.

The previous prime is 81202747. The next prime is 81202841. The reversal of 81202825 is 52820218.

It is not a de Polignac number, because 81202825 - 2¹⁵ = 81170057 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81202793 and 81202802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147367 + ... + 147916.

It is an arithmetic number, because the mean of its divisors is an integer number (9153804).

Almost surely, 2^81202825 is an apocalyptic number.

It is an amenable number.

81202825 is a deficient number, since it is larger than the sum of its proper divisors (28642823).

81202825 is a wasteful number, since it uses less digits than its factorization.

81202825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295304 (or 295299 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 81202825 is about 9011.2610105357. The cubic root of 81202825 is about 433.0357111499.

The spelling of 81202825 in words is "eighty-one million, two hundred two thousand, eight hundred twenty-five".