81163000 has 32 divisors (see below), whose sum is σ = 189923760. Its totient is φ = 32464800.

The previous prime is 81162997. The next prime is 81163009. The reversal of 81163000 is 36118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81163009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39582 + ... + 41581.

Almost surely, 2^81163000 is an apocalyptic number.

It is an amenable number.

81163000 is an abundant number, since it is smaller than the sum of its proper divisors (108760760).

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

81163000 is a wasteful number, since it uses less digits than its factorization.

81163000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81184 (or 81170 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 81163000 is about 9009.0510044066. The cubic root of 81163000 is about 432.9649070973.

Adding to 81163000 its reverse (36118), we get a palindrome (81199118).

The spelling of 81163000 in words is "eighty-one million, one hundred sixty-three thousand".