81197932 has 24 divisors (see below), whose sum is σ = 145860176. Its totient is φ = 39529728.

The previous prime is 81197929. The next prime is 81197947. The reversal of 81197932 is 23979118.

It is a super-2 number, since 2×81197932² = 13186208322153248, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 78088 + ... + 79120.

Almost surely, 2^81197932 is an apocalyptic number.

It is an amenable number.

81197932 is a deficient number, since it is larger than the sum of its proper divisors (64662244).

81197932 is a wasteful number, since it uses less digits than its factorization.

81197932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537 (or 1535 counting only the distinct ones).

The product of its digits is 27216, while the sum is 40.

The square root of 81197932 is about 9010.9895128116. The cubic root of 81197932 is about 433.0270132329.

The spelling of 81197932 in words is "eighty-one million, one hundred ninety-seven thousand, nine hundred thirty-two".