81009150 has 24 divisors (see below), whose sum is σ = 200903064. Its totient is φ = 21602400.

The previous prime is 81009133. The next prime is 81009161. The reversal of 81009150 is 5190018.

It is a self number, because there is not a number n which added to its sum of digits gives 81009150.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 269881 + ... + 270180.

It is an arithmetic number, because the mean of its divisors is an integer number (8370961).

Almost surely, 2^81009150 is an apocalyptic number.

81009150 is an abundant number, since it is smaller than the sum of its proper divisors (119893914).

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

81009150 is a wasteful number, since it uses less digits than its factorization.

81009150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540076 (or 540071 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 24.

The square root of 81009150 is about 9000.5083189784. The cubic root of 81009150 is about 432.6911625573.

Adding to 81009150 its reverse (5190018), we get a palindrome (86199168).

The spelling of 81009150 in words is "eighty-one million, nine thousand, one hundred fifty".