81196190 has 16 divisors (see below), whose sum is σ = 146972880. Its totient is φ = 32296320.

The previous prime is 81196183. The next prime is 81196211. The reversal of 81196190 is 9169118.

It is a super-2 number, since 2×81196190² = 13185642541032200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81196190.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20891 + ... + 24470.

It is an arithmetic number, because the mean of its divisors is an integer number (9185805).

Almost surely, 2^81196190 is an apocalyptic number.

81196190 is a deficient number, since it is larger than the sum of its proper divisors (65776690).

81196190 is a wasteful number, since it uses less digits than its factorization.

81196190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45547.

The product of its (nonzero) digits is 3888, while the sum is 35.

The square root of 81196190 is about 9010.8928525424. The cubic root of 81196190 is about 433.0239165266.

The spelling of 81196190 in words is "eighty-one million, one hundred ninety-six thousand, one hundred ninety".