81193352 has 8 divisors (see below), whose sum is σ = 152237550. Its totient is φ = 40596672.

The previous prime is 81193351. The next prime is 81193361. The reversal of 81193352 is 25339118.

It can be written as a sum of positive squares in only one way, i.e., 67010596 + 14182756 = 8186^2 + 3766^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (81193351) by changing a digit.

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 as a sum of consecutive naturals, namely, 5074577 + ... + 5074592.

Almost surely, 2^81193352 is an apocalyptic number.

It is an amenable number.

81193352 is a deficient number, since it is larger than the sum of its proper divisors (71044198).

81193352 is a wasteful number, since it uses less digits than its factorization.

81193352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10149175 (or 10149171 counting only the distinct ones).

The product of its digits is 6480, while the sum is 32.

The square root of 81193352 is about 9010.7353750956. The cubic root of 81193352 is about 433.0188713958.

The spelling of 81193352 in words is "eighty-one million, one hundred ninety-three thousand, three hundred fifty-two".