81193256 has 16 divisors (see below), whose sum is σ = 154072800. Its totient is φ = 40107184.

The previous prime is 81193223. The next prime is 81193261. The reversal of 81193256 is 65239118.

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, 60476 + ... + 61803.

It is an arithmetic number, because the mean of its divisors is an integer number (9629550).

Almost surely, 2^81193256 is an apocalyptic number.

It is an amenable number.

81193256 is a deficient number, since it is larger than the sum of its proper divisors (72879544).

81193256 is a wasteful number, since it uses less digits than its factorization.

81193256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122368 (or 122364 counting only the distinct ones).

The product of its digits is 12960, while the sum is 35.

The square root of 81193256 is about 9010.7300481149. The cubic root of 81193256 is about 433.0187007339.

The spelling of 81193256 in words is "eighty-one million, one hundred ninety-three thousand, two hundred fifty-six".