81163192 has 16 divisors (see below), whose sum is σ = 166015800. Its totient is φ = 36892320.

The previous prime is 81163183. The next prime is 81163207. The reversal of 81163192 is 29136118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 461067 + ... + 461242.

Almost surely, 2^81163192 is an apocalyptic number.

It is an amenable number.

81163192 is an abundant number, since it is smaller than the sum of its proper divisors (84852608).

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

81163192 is a wasteful number, since it uses less digits than its factorization.

81163192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922326 (or 922322 counting only the distinct ones).

The product of its digits is 2592, while the sum is 31.

The square root of 81163192 is about 9009.0616603506. The cubic root of 81163192 is about 432.9652485057.

The spelling of 81163192 in words is "eighty-one million, one hundred sixty-three thousand, one hundred ninety-two".