81935192 has 8 divisors (see below), whose sum is σ = 153628500. Its totient is φ = 40967592.

The previous prime is 81935153. The next prime is 81935197. The reversal of 81935192 is 29153918.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81935197) 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, 5120942 + ... + 5120957.

Almost surely, 2^81935192 is an apocalyptic number.

It is an amenable number.

81935192 is a deficient number, since it is larger than the sum of its proper divisors (71693308).

81935192 is a wasteful number, since it uses less digits than its factorization.

81935192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10241905 (or 10241901 counting only the distinct ones).

The product of its digits is 19440, while the sum is 38.

The square root of 81935192 is about 9051.8060076429. The cubic root of 81935192 is about 434.3336642825. Note that the first 3 decimals are identical.

The spelling of 81935192 in words is "eighty-one million, nine hundred thirty-five thousand, one hundred ninety-two".