81190935 has 48 divisors (see below), whose sum is σ = 163278336. Its totient is φ = 36552384.

The previous prime is 81190919. The next prime is 81190957. The reversal of 81190935 is 53909118.

It is a happy number.

It is not a de Polignac number, because 81190935 - 2⁴ = 81190919 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81190935.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 19182 + ... + 23028.

It is an arithmetic number, because the mean of its divisors is an integer number (3401632).

Almost surely, 2^81190935 is an apocalyptic number.

81190935 is an abundant number, since it is smaller than the sum of its proper divisors (82087401).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81190935 is a wasteful number, since it uses less digits than its factorization.

81190935 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3932 (or 3929 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 81190935 is about 9010.6012562981. The cubic root of 81190935 is about 433.0145745867.

The spelling of 81190935 in words is "eighty-one million, one hundred ninety thousand, nine hundred thirty-five".