81195156 has 144 divisors (see below), whose sum is σ = 249614400. Its totient is φ = 22752576.

The previous prime is 81195109. The next prime is 81195161. The reversal of 81195156 is 65159118.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 81195156.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 354450 + ... + 354678.

Almost surely, 2^81195156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81195156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124807200).

81195156 is an abundant number, since it is smaller than the sum of its proper divisors (168419244).

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

81195156 is a wasteful number, since it uses less digits than its factorization.

81195156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323 (or 308 counting only the distinct ones).

The product of its digits is 10800, while the sum is 36.

The square root of 81195156 is about 9010.8354773572. The cubic root of 81195156 is about 433.0220783918.

The spelling of 81195156 in words is "eighty-one million, one hundred ninety-five thousand, one hundred fifty-six".