81522325 has 12 divisors (see below), whose sum is σ = 101199748. Its totient is φ = 65145600.

The previous prime is 81522323. The next prime is 81522349. The reversal of 81522325 is 52322518.

It can be written as a sum of positive squares in 6 ways, for example, as 44275716 + 37246609 = 6654^2 + 6103^2 .

It is not a de Polignac number, because 81522325 - 2¹ = 81522323 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81522293 and 81522302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81522323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42589 + ... + 44461.

Almost surely, 2^81522325 is an apocalyptic number.

It is an amenable number.

81522325 is a deficient number, since it is larger than the sum of its proper divisors (19677423).

81522325 is a wasteful number, since it uses less digits than its factorization.

81522325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3624 (or 3619 counting only the distinct ones).

The product of its digits is 4800, while the sum is 28.

The square root of 81522325 is about 9028.9714253618. The cubic root of 81522325 is about 433.6029075441.

The spelling of 81522325 in words is "eighty-one million, five hundred twenty-two thousand, three hundred twenty-five".