81195532 has 12 divisors (see below), whose sum is σ = 155009736. Its totient is φ = 36907040.

The previous prime is 81195509. The next prime is 81195557. The reversal of 81195532 is 23559118.

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 3 ways as a sum of consecutive naturals, for example, 922633 + ... + 922720.

It is an arithmetic number, because the mean of its divisors is an integer number (12917478).

Almost surely, 2^81195532 is an apocalyptic number.

It is an amenable number.

81195532 is a deficient number, since it is larger than the sum of its proper divisors (73814204).

81195532 is a wasteful number, since it uses less digits than its factorization.

81195532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1845368 (or 1845366 counting only the distinct ones).

The product of its digits is 10800, while the sum is 34.

The square root of 81195532 is about 9010.8563411032. The cubic root of 81195532 is about 433.0227468062.

The spelling of 81195532 in words is "eighty-one million, one hundred ninety-five thousand, five hundred thirty-two".